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| author | Peter Zijlstra <[email protected]> | 2021-03-03 16:45:41 +0100 |
|---|---|---|
| committer | Peter Zijlstra <[email protected]> | 2021-05-12 11:43:27 +0200 |
| commit | 9ef7e7e33bcdb57be1afb28884053c28b5f05240 (patch) | |
| tree | 40e43fa4c6d82adf7cd39fbc1f5dfb868701165b /tools/perf/scripts/python/syscall-counts-by-pid.py | |
| parent | 9edeaea1bc452372718837ed2ba775811baf1ba1 (diff) | |
sched: Optimize rq_lockp() usage
rq_lockp() includes a static_branch(), which is asm-goto, which is
asm volatile which defeats regular CSE. This means that:
if (!static_branch(&foo))
return simple;
if (static_branch(&foo) && cond)
return complex;
Doesn't fold and we get horrible code. Introduce __rq_lockp() without
the static_branch() on.
Signed-off-by: Peter Zijlstra (Intel) <[email protected]>
Tested-by: Don Hiatt <[email protected]>
Tested-by: Hongyu Ning <[email protected]>
Tested-by: Vincent Guittot <[email protected]>
Link: https://lkml.kernel.org/r/[email protected]
Diffstat (limited to 'tools/perf/scripts/python/syscall-counts-by-pid.py')
0 files changed, 0 insertions, 0 deletions