520 lines
18 KiB
Plaintext
520 lines
18 KiB
Plaintext
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What: /sys/kernel/slab
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Date: May 2007
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KernelVersion: 2.6.22
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Contact: Pekka Enberg <penberg@cs.helsinki.fi>,
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Christoph Lameter <cl@linux-foundation.org>
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Description:
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The /sys/kernel/slab directory contains a snapshot of the
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internal state of the SLUB allocator for each cache. Certain
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files may be modified to change the behavior of the cache (and
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any cache it aliases, if any).
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Users: kernel memory tuning tools
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What: /sys/kernel/slab/<cache>/aliases
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Date: May 2007
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KernelVersion: 2.6.22
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Contact: Pekka Enberg <penberg@cs.helsinki.fi>,
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Christoph Lameter <cl@linux-foundation.org>
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Description:
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The aliases file is read-only and specifies how many caches
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have merged into this cache.
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What: /sys/kernel/slab/<cache>/align
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Date: May 2007
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KernelVersion: 2.6.22
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Contact: Pekka Enberg <penberg@cs.helsinki.fi>,
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Christoph Lameter <cl@linux-foundation.org>
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Description:
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The align file is read-only and specifies the cache's object
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alignment in bytes.
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What: /sys/kernel/slab/<cache>/alloc_calls
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Date: May 2007
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KernelVersion: 2.6.22
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Contact: Pekka Enberg <penberg@cs.helsinki.fi>,
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Christoph Lameter <cl@linux-foundation.org>
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Description:
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The alloc_calls file is read-only and lists the kernel code
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locations from which allocations for this cache were performed.
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The alloc_calls file only contains information if debugging is
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enabled for that cache (see Documentation/mm/slub.rst).
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What: /sys/kernel/slab/<cache>/alloc_fastpath
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Date: February 2008
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KernelVersion: 2.6.25
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Contact: Pekka Enberg <penberg@cs.helsinki.fi>,
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Christoph Lameter <cl@linux-foundation.org>
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Description:
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The alloc_fastpath file shows how many objects have been
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allocated using the fast path. It can be written to clear the
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current count.
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Available when CONFIG_SLUB_STATS is enabled.
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What: /sys/kernel/slab/<cache>/alloc_from_partial
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Date: February 2008
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KernelVersion: 2.6.25
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Contact: Pekka Enberg <penberg@cs.helsinki.fi>,
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Christoph Lameter <cl@linux-foundation.org>
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Description:
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The alloc_from_partial file shows how many times a cpu slab has
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been full and it has been refilled by using a slab from the list
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of partially used slabs. It can be written to clear the current
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count.
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Available when CONFIG_SLUB_STATS is enabled.
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What: /sys/kernel/slab/<cache>/alloc_refill
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Date: February 2008
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KernelVersion: 2.6.25
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Contact: Pekka Enberg <penberg@cs.helsinki.fi>,
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Christoph Lameter <cl@linux-foundation.org>
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Description:
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The alloc_refill file shows how many times the per-cpu freelist
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was empty but there were objects available as the result of
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remote cpu frees. It can be written to clear the current count.
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Available when CONFIG_SLUB_STATS is enabled.
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What: /sys/kernel/slab/<cache>/alloc_slab
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Date: February 2008
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KernelVersion: 2.6.25
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Contact: Pekka Enberg <penberg@cs.helsinki.fi>,
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Christoph Lameter <cl@linux-foundation.org>
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Description:
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The alloc_slab file is shows how many times a new slab had to
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be allocated from the page allocator. It can be written to
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clear the current count.
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Available when CONFIG_SLUB_STATS is enabled.
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What: /sys/kernel/slab/<cache>/alloc_slowpath
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Date: February 2008
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KernelVersion: 2.6.25
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Contact: Pekka Enberg <penberg@cs.helsinki.fi>,
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Christoph Lameter <cl@linux-foundation.org>
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Description:
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The alloc_slowpath file shows how many objects have been
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allocated using the slow path because of a refill or
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allocation from a partial or new slab. It can be written to
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clear the current count.
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Available when CONFIG_SLUB_STATS is enabled.
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What: /sys/kernel/slab/<cache>/cache_dma
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Date: May 2007
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KernelVersion: 2.6.22
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Contact: Pekka Enberg <penberg@cs.helsinki.fi>,
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Christoph Lameter <cl@linux-foundation.org>
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Description:
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The cache_dma file is read-only and specifies whether objects
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are from ZONE_DMA.
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Available when CONFIG_ZONE_DMA is enabled.
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What: /sys/kernel/slab/<cache>/cpu_slabs
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Date: May 2007
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KernelVersion: 2.6.22
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Contact: Pekka Enberg <penberg@cs.helsinki.fi>,
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Christoph Lameter <cl@linux-foundation.org>
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Description:
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The cpu_slabs file is read-only and displays how many cpu slabs
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are active and their NUMA locality.
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What: /sys/kernel/slab/<cache>/cpuslab_flush
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Date: April 2009
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KernelVersion: 2.6.31
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Contact: Pekka Enberg <penberg@cs.helsinki.fi>,
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Christoph Lameter <cl@linux-foundation.org>
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Description:
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The file cpuslab_flush shows how many times a cache's cpu slabs
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have been flushed as the result of destroying or shrinking a
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cache, a cpu going offline, or as the result of forcing an
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allocation from a certain node. It can be written to clear the
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current count.
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Available when CONFIG_SLUB_STATS is enabled.
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What: /sys/kernel/slab/<cache>/ctor
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Date: May 2007
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KernelVersion: 2.6.22
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Contact: Pekka Enberg <penberg@cs.helsinki.fi>,
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Christoph Lameter <cl@linux-foundation.org>
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Description:
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The ctor file is read-only and specifies the cache's object
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constructor function, which is invoked for each object when a
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new slab is allocated.
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What: /sys/kernel/slab/<cache>/deactivate_empty
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Date: February 2008
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KernelVersion: 2.6.25
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Contact: Pekka Enberg <penberg@cs.helsinki.fi>,
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Christoph Lameter <cl@linux-foundation.org>
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Description:
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The deactivate_empty file shows how many times an empty cpu slab
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was deactivated. It can be written to clear the current count.
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Available when CONFIG_SLUB_STATS is enabled.
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What: /sys/kernel/slab/<cache>/deactivate_full
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Date: February 2008
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KernelVersion: 2.6.25
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Contact: Pekka Enberg <penberg@cs.helsinki.fi>,
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Christoph Lameter <cl@linux-foundation.org>
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Description:
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The deactivate_full file shows how many times a full cpu slab
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was deactivated. It can be written to clear the current count.
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Available when CONFIG_SLUB_STATS is enabled.
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What: /sys/kernel/slab/<cache>/deactivate_remote_frees
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Date: February 2008
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KernelVersion: 2.6.25
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Contact: Pekka Enberg <penberg@cs.helsinki.fi>,
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Christoph Lameter <cl@linux-foundation.org>
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Description:
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The deactivate_remote_frees file shows how many times a cpu slab
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has been deactivated and contained free objects that were freed
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remotely. It can be written to clear the current count.
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Available when CONFIG_SLUB_STATS is enabled.
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What: /sys/kernel/slab/<cache>/deactivate_to_head
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Date: February 2008
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KernelVersion: 2.6.25
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Contact: Pekka Enberg <penberg@cs.helsinki.fi>,
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Christoph Lameter <cl@linux-foundation.org>
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Description:
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The deactivate_to_head file shows how many times a partial cpu
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slab was deactivated and added to the head of its node's partial
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list. It can be written to clear the current count.
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Available when CONFIG_SLUB_STATS is enabled.
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What: /sys/kernel/slab/<cache>/deactivate_to_tail
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Date: February 2008
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KernelVersion: 2.6.25
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Contact: Pekka Enberg <penberg@cs.helsinki.fi>,
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Christoph Lameter <cl@linux-foundation.org>
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Description:
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The deactivate_to_tail file shows how many times a partial cpu
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slab was deactivated and added to the tail of its node's partial
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list. It can be written to clear the current count.
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Available when CONFIG_SLUB_STATS is enabled.
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What: /sys/kernel/slab/<cache>/destroy_by_rcu
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Date: May 2007
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KernelVersion: 2.6.22
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Contact: Pekka Enberg <penberg@cs.helsinki.fi>,
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Christoph Lameter <cl@linux-foundation.org>
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Description:
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The destroy_by_rcu file is read-only and specifies whether
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slabs (not objects) are freed by rcu.
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What: /sys/kernel/slab/<cache>/free_add_partial
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Date: February 2008
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KernelVersion: 2.6.25
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Contact: Pekka Enberg <penberg@cs.helsinki.fi>,
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Christoph Lameter <cl@linux-foundation.org>
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Description:
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The free_add_partial file shows how many times an object has
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been freed in a full slab so that it had to added to its node's
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partial list. It can be written to clear the current count.
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Available when CONFIG_SLUB_STATS is enabled.
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What: /sys/kernel/slab/<cache>/free_calls
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Date: May 2007
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KernelVersion: 2.6.22
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Contact: Pekka Enberg <penberg@cs.helsinki.fi>,
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Christoph Lameter <cl@linux-foundation.org>
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Description:
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The free_calls file is read-only and lists the locations of
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object frees if slab debugging is enabled (see
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Documentation/mm/slub.rst).
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What: /sys/kernel/slab/<cache>/free_fastpath
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Date: February 2008
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KernelVersion: 2.6.25
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Contact: Pekka Enberg <penberg@cs.helsinki.fi>,
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Christoph Lameter <cl@linux-foundation.org>
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Description:
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The free_fastpath file shows how many objects have been freed
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using the fast path because it was an object from the cpu slab.
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It can be written to clear the current count.
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Available when CONFIG_SLUB_STATS is enabled.
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What: /sys/kernel/slab/<cache>/free_frozen
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Date: February 2008
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KernelVersion: 2.6.25
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Contact: Pekka Enberg <penberg@cs.helsinki.fi>,
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Christoph Lameter <cl@linux-foundation.org>
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Description:
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The free_frozen file shows how many objects have been freed to
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a frozen slab (i.e. a remote cpu slab). It can be written to
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clear the current count.
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Available when CONFIG_SLUB_STATS is enabled.
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What: /sys/kernel/slab/<cache>/free_remove_partial
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Date: February 2008
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KernelVersion: 2.6.25
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Contact: Pekka Enberg <penberg@cs.helsinki.fi>,
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Christoph Lameter <cl@linux-foundation.org>
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Description:
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The free_remove_partial file shows how many times an object has
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been freed to a now-empty slab so that it had to be removed from
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its node's partial list. It can be written to clear the current
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count.
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Available when CONFIG_SLUB_STATS is enabled.
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What: /sys/kernel/slab/<cache>/free_slab
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Date: February 2008
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KernelVersion: 2.6.25
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Contact: Pekka Enberg <penberg@cs.helsinki.fi>,
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Christoph Lameter <cl@linux-foundation.org>
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Description:
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The free_slab file shows how many times an empty slab has been
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freed back to the page allocator. It can be written to clear
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the current count.
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Available when CONFIG_SLUB_STATS is enabled.
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What: /sys/kernel/slab/<cache>/free_slowpath
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Date: February 2008
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KernelVersion: 2.6.25
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Contact: Pekka Enberg <penberg@cs.helsinki.fi>,
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Christoph Lameter <cl@linux-foundation.org>
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Description:
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The free_slowpath file shows how many objects have been freed
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using the slow path (i.e. to a full or partial slab). It can
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be written to clear the current count.
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Available when CONFIG_SLUB_STATS is enabled.
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What: /sys/kernel/slab/<cache>/hwcache_align
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Date: May 2007
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KernelVersion: 2.6.22
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Contact: Pekka Enberg <penberg@cs.helsinki.fi>,
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Christoph Lameter <cl@linux-foundation.org>
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Description:
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The hwcache_align file is read-only and specifies whether
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objects are aligned on cachelines.
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What: /sys/kernel/slab/<cache>/min_partial
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Date: February 2009
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KernelVersion: 2.6.30
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Contact: Pekka Enberg <penberg@cs.helsinki.fi>,
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David Rientjes <rientjes@google.com>
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Description:
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The min_partial file specifies how many empty slabs shall
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remain on a node's partial list to avoid the overhead of
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allocating new slabs. Such slabs may be reclaimed by utilizing
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the shrink file.
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What: /sys/kernel/slab/<cache>/object_size
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Date: May 2007
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KernelVersion: 2.6.22
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Contact: Pekka Enberg <penberg@cs.helsinki.fi>,
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Christoph Lameter <cl@linux-foundation.org>
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Description:
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The object_size file is read-only and specifies the cache's
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object size.
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What: /sys/kernel/slab/<cache>/objects
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Date: May 2007
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KernelVersion: 2.6.22
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Contact: Pekka Enberg <penberg@cs.helsinki.fi>,
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Christoph Lameter <cl@linux-foundation.org>
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Description:
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The objects file is read-only and displays how many objects are
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active and from which nodes they are from.
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What: /sys/kernel/slab/<cache>/objects_partial
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Date: April 2008
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KernelVersion: 2.6.26
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Contact: Pekka Enberg <penberg@cs.helsinki.fi>,
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Christoph Lameter <cl@linux-foundation.org>
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Description:
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The objects_partial file is read-only and displays how many
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objects are on partial slabs and from which nodes they are
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from.
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What: /sys/kernel/slab/<cache>/objs_per_slab
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Date: May 2007
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KernelVersion: 2.6.22
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Contact: Pekka Enberg <penberg@cs.helsinki.fi>,
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Christoph Lameter <cl@linux-foundation.org>
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Description:
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The file objs_per_slab is read-only and specifies how many
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objects may be allocated from a single slab of the order
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specified in /sys/kernel/slab/<cache>/order.
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What: /sys/kernel/slab/<cache>/order
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Date: May 2007
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KernelVersion: 2.6.22
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Contact: Pekka Enberg <penberg@cs.helsinki.fi>,
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Christoph Lameter <cl@linux-foundation.org>
|
||
|
|
Description:
|
||
|
|
The order file specifies the page order at which new slabs are
|
||
|
|
allocated. It is writable and can be changed to increase the
|
||
|
|
number of objects per slab. If a slab cannot be allocated
|
||
|
|
because of fragmentation, SLUB will retry with the minimum order
|
||
|
|
possible depending on its characteristics.
|
||
|
|
|
||
|
|
When debug_guardpage_minorder=N (N > 0) parameter is specified
|
||
|
|
(see Documentation/admin-guide/kernel-parameters.rst), the minimum possible
|
||
|
|
order is used and this sysfs entry can not be used to change
|
||
|
|
the order at run time.
|
||
|
|
|
||
|
|
What: /sys/kernel/slab/<cache>/order_fallback
|
||
|
|
Date: April 2008
|
||
|
|
KernelVersion: 2.6.26
|
||
|
|
Contact: Pekka Enberg <penberg@cs.helsinki.fi>,
|
||
|
|
Christoph Lameter <cl@linux-foundation.org>
|
||
|
|
Description:
|
||
|
|
The order_fallback file shows how many times an allocation of a
|
||
|
|
new slab has not been possible at the cache's order and instead
|
||
|
|
fallen back to its minimum possible order. It can be written to
|
||
|
|
clear the current count.
|
||
|
|
|
||
|
|
Available when CONFIG_SLUB_STATS is enabled.
|
||
|
|
|
||
|
|
What: /sys/kernel/slab/<cache>/partial
|
||
|
|
Date: May 2007
|
||
|
|
KernelVersion: 2.6.22
|
||
|
|
Contact: Pekka Enberg <penberg@cs.helsinki.fi>,
|
||
|
|
Christoph Lameter <cl@linux-foundation.org>
|
||
|
|
Description:
|
||
|
|
The partial file is read-only and displays how long many
|
||
|
|
partial slabs there are and how long each node's list is.
|
||
|
|
|
||
|
|
What: /sys/kernel/slab/<cache>/poison
|
||
|
|
Date: May 2007
|
||
|
|
KernelVersion: 2.6.22
|
||
|
|
Contact: Pekka Enberg <penberg@cs.helsinki.fi>,
|
||
|
|
Christoph Lameter <cl@linux-foundation.org>
|
||
|
|
Description:
|
||
|
|
The poison file specifies whether objects should be poisoned
|
||
|
|
when a new slab is allocated.
|
||
|
|
|
||
|
|
What: /sys/kernel/slab/<cache>/reclaim_account
|
||
|
|
Date: May 2007
|
||
|
|
KernelVersion: 2.6.22
|
||
|
|
Contact: Pekka Enberg <penberg@cs.helsinki.fi>,
|
||
|
|
Christoph Lameter <cl@linux-foundation.org>
|
||
|
|
Description:
|
||
|
|
The reclaim_account file specifies whether the cache's objects
|
||
|
|
are reclaimable (and grouped by their mobility).
|
||
|
|
|
||
|
|
What: /sys/kernel/slab/<cache>/red_zone
|
||
|
|
Date: May 2007
|
||
|
|
KernelVersion: 2.6.22
|
||
|
|
Contact: Pekka Enberg <penberg@cs.helsinki.fi>,
|
||
|
|
Christoph Lameter <cl@linux-foundation.org>
|
||
|
|
Description:
|
||
|
|
The red_zone file specifies whether the cache's objects are red
|
||
|
|
zoned.
|
||
|
|
|
||
|
|
What: /sys/kernel/slab/<cache>/remote_node_defrag_ratio
|
||
|
|
Date: January 2008
|
||
|
|
KernelVersion: 2.6.25
|
||
|
|
Contact: Pekka Enberg <penberg@cs.helsinki.fi>,
|
||
|
|
Christoph Lameter <cl@linux-foundation.org>
|
||
|
|
Description:
|
||
|
|
The file remote_node_defrag_ratio specifies the percentage of
|
||
|
|
times SLUB will attempt to refill the cpu slab with a partial
|
||
|
|
slab from a remote node as opposed to allocating a new slab on
|
||
|
|
the local node. This reduces the amount of wasted memory over
|
||
|
|
the entire system but can be expensive.
|
||
|
|
|
||
|
|
Available when CONFIG_NUMA is enabled.
|
||
|
|
|
||
|
|
What: /sys/kernel/slab/<cache>/sanity_checks
|
||
|
|
Date: May 2007
|
||
|
|
KernelVersion: 2.6.22
|
||
|
|
Contact: Pekka Enberg <penberg@cs.helsinki.fi>,
|
||
|
|
Christoph Lameter <cl@linux-foundation.org>
|
||
|
|
Description:
|
||
|
|
The sanity_checks file specifies whether expensive checks
|
||
|
|
should be performed on free and, at minimum, enables double free
|
||
|
|
checks. Caches that enable sanity_checks cannot be merged with
|
||
|
|
caches that do not.
|
||
|
|
|
||
|
|
What: /sys/kernel/slab/<cache>/shrink
|
||
|
|
Date: May 2007
|
||
|
|
KernelVersion: 2.6.22
|
||
|
|
Contact: Pekka Enberg <penberg@cs.helsinki.fi>,
|
||
|
|
Christoph Lameter <cl@linux-foundation.org>
|
||
|
|
Description:
|
||
|
|
The shrink file is used to reclaim unused slab cache
|
||
|
|
memory from a cache. Empty per-cpu or partial slabs
|
||
|
|
are freed and the partial list is sorted so the slabs
|
||
|
|
with the fewest available objects are used first.
|
||
|
|
It only accepts a value of "1" on write for shrinking
|
||
|
|
the cache. Other input values are considered invalid.
|
||
|
|
Shrinking slab caches might be expensive and can
|
||
|
|
adversely impact other running applications. So it
|
||
|
|
should be used with care.
|
||
|
|
|
||
|
|
What: /sys/kernel/slab/<cache>/slab_size
|
||
|
|
Date: May 2007
|
||
|
|
KernelVersion: 2.6.22
|
||
|
|
Contact: Pekka Enberg <penberg@cs.helsinki.fi>,
|
||
|
|
Christoph Lameter <cl@linux-foundation.org>
|
||
|
|
Description:
|
||
|
|
The slab_size file is read-only and specifies the object size
|
||
|
|
with metadata (debugging information and alignment) in bytes.
|
||
|
|
|
||
|
|
What: /sys/kernel/slab/<cache>/slabs
|
||
|
|
Date: May 2007
|
||
|
|
KernelVersion: 2.6.22
|
||
|
|
Contact: Pekka Enberg <penberg@cs.helsinki.fi>,
|
||
|
|
Christoph Lameter <cl@linux-foundation.org>
|
||
|
|
Description:
|
||
|
|
The slabs file is read-only and displays how long many slabs
|
||
|
|
there are (both cpu and partial) and from which nodes they are
|
||
|
|
from.
|
||
|
|
|
||
|
|
What: /sys/kernel/slab/<cache>/store_user
|
||
|
|
Date: May 2007
|
||
|
|
KernelVersion: 2.6.22
|
||
|
|
Contact: Pekka Enberg <penberg@cs.helsinki.fi>,
|
||
|
|
Christoph Lameter <cl@linux-foundation.org>
|
||
|
|
Description:
|
||
|
|
The store_user file specifies whether the location of
|
||
|
|
allocation or free should be tracked for a cache.
|
||
|
|
|
||
|
|
What: /sys/kernel/slab/<cache>/total_objects
|
||
|
|
Date: April 2008
|
||
|
|
KernelVersion: 2.6.26
|
||
|
|
Contact: Pekka Enberg <penberg@cs.helsinki.fi>,
|
||
|
|
Christoph Lameter <cl@linux-foundation.org>
|
||
|
|
Description:
|
||
|
|
The total_objects file is read-only and displays how many total
|
||
|
|
objects a cache has and from which nodes they are from.
|
||
|
|
|
||
|
|
What: /sys/kernel/slab/<cache>/trace
|
||
|
|
Date: May 2007
|
||
|
|
KernelVersion: 2.6.22
|
||
|
|
Contact: Pekka Enberg <penberg@cs.helsinki.fi>,
|
||
|
|
Christoph Lameter <cl@linux-foundation.org>
|
||
|
|
Description:
|
||
|
|
The trace file specifies whether object allocations and frees
|
||
|
|
should be traced.
|
||
|
|
|
||
|
|
What: /sys/kernel/slab/<cache>/validate
|
||
|
|
Date: May 2007
|
||
|
|
KernelVersion: 2.6.22
|
||
|
|
Contact: Pekka Enberg <penberg@cs.helsinki.fi>,
|
||
|
|
Christoph Lameter <cl@linux-foundation.org>
|
||
|
|
Description:
|
||
|
|
Writing to the validate file causes SLUB to traverse all of its
|
||
|
|
cache's objects and check the validity of metadata.
|
||
|
|
|
||
|
|
What: /sys/kernel/slab/<cache>/usersize
|
||
|
|
Date: Jun 2017
|
||
|
|
Contact: David Windsor <dave@nullcore.net>
|
||
|
|
Description:
|
||
|
|
The usersize file is read-only and contains the usercopy
|
||
|
|
region size.
|
||
|
|
|
||
|
|
What: /sys/kernel/slab/<cache>/slabs_cpu_partial
|
||
|
|
Date: Aug 2011
|
||
|
|
Contact: Christoph Lameter <cl@linux.com>
|
||
|
|
Description:
|
||
|
|
This read-only file shows the number of partialli allocated
|
||
|
|
frozen slabs.
|
||
|
|
|
||
|
|
What: /sys/kernel/slab/<cache>/cpu_partial
|
||
|
|
Date: Aug 2011
|
||
|
|
Contact: Christoph Lameter <cl@linux.com>
|
||
|
|
Description:
|
||
|
|
This read-only file shows the number of per cpu partial
|
||
|
|
pages to keep around.
|