Greg Kroah-Hartman
598cf27219
Link: https://lore.kernel.org/r/20260217200002.683975158@linuxfoundation.org Tested-by: Florian Fainelli <florian.fainelli@broadcom.com> Tested-by: Takeshi Ogasawara <takeshi.ogasawara@futuring-girl.com> Tested-by: Peter Schneider <pschneider1968@googlemail.com> Tested-by: Jon Hunter <jonathanh@nvidia.com> Tested-by: Salvatore Bonaccorso <carnil@debian.org> Tested-by: Brett A C Sheffield <bacs@librecast.net> Tested-by: Mark Brown <broonie@kernel.org> Tested-by: Luna Jernberg <droidbittin@gmail.com> Tested-by: Ronald Warsow <rwarsow@gmx.de> Tested-by: Justin M. Forbes <jforbes@fedoraproject.org> Tested-by: Ron Economos <re@w6rz.net> Tested-by: Miguel Ojeda <ojeda@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
37 lines
850 B
C
37 lines
850 B
C
// 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(void)
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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(online_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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{
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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())
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return true;
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return cpu_topology__core_wide(online_topology(), user_requested_cpu_list);
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}
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