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| author | Rik van Riel <riel@surriel.com> | 2024-11-09 03:27:50 +0300 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2024-11-13 05:42:41 +0300 |
| commit | 7e33001b8b9a78062679e0fdf5b0842a49063135 (patch) | |
| tree | a4d43a057f795ab7c76358c7a80ff5a57b1526c2 /tools/perf/scripts/python/stackcollapse.py | |
| parent | abe949ce0f9be943d8762f91e04b8588255f2f70 (diff) | |
| download | linux-7e33001b8b9a78062679e0fdf5b0842a49063135.tar.xz | |
x86/mm/tlb: Put cpumask_test_cpu() check in switch_mm_irqs_off() under CONFIG_DEBUG_VM
On a web server workload, the cpumask_test_cpu() inside the
WARN_ON_ONCE() in the 'prev == next branch' takes about 17% of
all the CPU time of switch_mm_irqs_off().
On a large fleet, this WARN_ON_ONCE() has not fired in at least
a month, possibly never.
Move this test under CONFIG_DEBUG_VM so it does not get compiled
in production kernels.
Signed-off-by: Rik van Riel <riel@surriel.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: https://lore.kernel.org/r/20241109003727.3958374-4-riel@surriel.com
Diffstat (limited to 'tools/perf/scripts/python/stackcollapse.py')
0 files changed, 0 insertions, 0 deletions