38 lines
916 B
C
38 lines
916 B
C
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// SPDX-License-Identifier: GPL-2.0-only
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#include <string.h>
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#include "api/fs/fs.h"
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#include "cputopo.h"
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#include "smt.h"
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bool smt_on(const struct cpu_topology *topology)
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{
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static bool cached;
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static bool cached_result;
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int fs_value;
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if (cached)
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return cached_result;
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if (sysfs__read_int("devices/system/cpu/smt/active", &fs_value) >= 0)
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cached_result = (fs_value == 1);
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else
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cached_result = cpu_topology__smt_on(topology);
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cached = true;
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return cached_result;
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}
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bool core_wide(bool system_wide, const char *user_requested_cpu_list,
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const struct cpu_topology *topology)
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{
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/* If not everything running on a core is being recorded then we can't use core_wide. */
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if (!system_wide)
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return false;
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/* Cheap case that SMT is disabled and therefore we're inherently core_wide. */
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if (!smt_on(topology))
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return true;
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return cpu_topology__core_wide(topology, user_requested_cpu_list);
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}
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