Messages in this thread Patch in this message | ![/](/images/icornerl.gif) | | Date | Sat, 18 May 2024 09:43:38 -0000 | From | "tip-bot2 for Uros Bizjak" <> | Subject | [tip: perf/urgent] perf/x86/amd: Use try_cmpxchg() in events/amd/{un,}core.c |
| |
The following commit has been merged into the perf/urgent branch of tip:
Commit-ID: cd84351c8c1baec86342d784feb884ace007d51c Gitweb: https://git.kernel.org/tip/cd84351c8c1baec86342d784feb884ace007d51c Author: Uros Bizjak <ubizjak@gmail.com> AuthorDate: Thu, 25 Apr 2024 12:16:14 +02:00 Committer: Ingo Molnar <mingo@kernel.org> CommitterDate: Sat, 18 May 2024 11:15:13 +02:00
perf/x86/amd: Use try_cmpxchg() in events/amd/{un,}core.c
Replace this pattern in events/amd/{un,}core.c:
cmpxchg(*ptr, old, new) == old
.. with the simpler and faster:
try_cmpxchg(*ptr, &old, new)
The x86 CMPXCHG instruction returns success in the ZF flag, so this change saves a compare after the CMPXCHG.
No functional change intended.
Signed-off-by: Uros Bizjak <ubizjak@gmail.com> Signed-off-by: Ingo Molnar <mingo@kernel.org> Link: https://lore.kernel.org/r/20240425101708.5025-1-ubizjak@gmail.com --- arch/x86/events/amd/core.c | 4 +++- arch/x86/events/amd/uncore.c | 8 ++++++-- 2 files changed, 9 insertions(+), 3 deletions(-)
diff --git a/arch/x86/events/amd/core.c b/arch/x86/events/amd/core.c index 1fc4ce4..18bfe34 100644 --- a/arch/x86/events/amd/core.c +++ b/arch/x86/events/amd/core.c @@ -433,7 +433,9 @@ static void __amd_put_nb_event_constraints(struct cpu_hw_events *cpuc, * when we come here */ for (i = 0; i < x86_pmu.num_counters; i++) { - if (cmpxchg(nb->owners + i, event, NULL) == event) + struct perf_event *tmp = event; + + if (try_cmpxchg(nb->owners + i, &tmp, NULL)) break; } } diff --git a/arch/x86/events/amd/uncore.c b/arch/x86/events/amd/uncore.c index 4ccb8fa..0fafe23 100644 --- a/arch/x86/events/amd/uncore.c +++ b/arch/x86/events/amd/uncore.c @@ -162,7 +162,9 @@ static int amd_uncore_add(struct perf_event *event, int flags) /* if not, take the first available counter */ hwc->idx = -1; for (i = 0; i < pmu->num_counters; i++) { - if (cmpxchg(&ctx->events[i], NULL, event) == NULL) { + struct perf_event *tmp = NULL; + + if (try_cmpxchg(&ctx->events[i], &tmp, event)) { hwc->idx = i; break; } @@ -196,7 +198,9 @@ static void amd_uncore_del(struct perf_event *event, int flags) event->pmu->stop(event, PERF_EF_UPDATE); for (i = 0; i < pmu->num_counters; i++) { - if (cmpxchg(&ctx->events[i], event, NULL) == event) + struct perf_event *tmp = event; + + if (try_cmpxchg(&ctx->events[i], &tmp, NULL)) break; }
| ![\](/images/icornerr.gif) |