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| author | Mark Johnston <markj@FreeBSD.org> | 2022-02-25 18:42:51 +0000 |
|---|---|---|
| committer | Mark Johnston <markj@FreeBSD.org> | 2022-02-25 18:55:24 +0000 |
| commit | c84bb8cd771ce4bed58152e47a32dda470bef23a (patch) | |
| tree | bd6df7f782222de9fcd72b699d22272d500a1535 | |
| parent | 1517b8d5a7f58897200497811de1b18809c07d3e (diff) | |
| download | src-c84bb8cd771ce4bed58152e47a32dda470bef23a.tar.gz src-c84bb8cd771ce4bed58152e47a32dda470bef23a.zip | |
rmlock: Micro-optimize read locking
Use get_pcpu() instead of an open-coded pcpu_find(td->td_oncpu). This
eliminates some memory accesses and results in a shorter instruction
sequence. Note that get_pcpu() didn't exist when rmlocks were added.
Reviewed by: jah, mjg
MFC after: 1 week
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D34377
| -rw-r--r-- | sys/kern/kern_rmlock.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/sys/kern/kern_rmlock.c b/sys/kern/kern_rmlock.c index 08a01fca9827..bbea8041360a 100644 --- a/sys/kern/kern_rmlock.c +++ b/sys/kern/kern_rmlock.c @@ -452,7 +452,7 @@ _rm_rlock(struct rmlock *rm, struct rm_priotracker *tracker, int trylock) atomic_interrupt_fence(); - pc = cpuid_to_pcpu[td->td_oncpu]; /* pcpu_find(td->td_oncpu); */ + pc = get_pcpu(); rm_tracker_add(pc, tracker); @@ -517,7 +517,7 @@ _rm_runlock(struct rmlock *rm, struct rm_priotracker *tracker) return; td->td_critnest++; /* critical_enter(); */ - pc = cpuid_to_pcpu[td->td_oncpu]; /* pcpu_find(td->td_oncpu); */ + pc = get_pcpu(); rm_tracker_remove(pc, tracker); td->td_critnest--; sched_unpin(); |