linux-kernel - [PATCH 5/5] perf: Optimize __pmu_ctx_sched

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20240807115550.392851915@infradead.org>
Date: Wed, 07 Aug 2024 13:29:29 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: mingo@...nel.org
Cc: peterz@...radead.org,
 acme@...nel.org,
 namhyung@...nel.org,
 mark.rutland@....com,
 alexander.shishkin@...ux.intel.com,
 jolsa@...nel.org,
 irogers@...gle.com,
 adrian.hunter@...el.com,
 kan.liang@...ux.intel.com,
 linux-perf-users@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: [PATCH 5/5] perf: Optimize __pmu_ctx_sched_out()

There is is no point in doing the perf_pmu_disable() dance just to do
nothing. This happens for ctx_sched_out(.type = EVENT_TIME) for
instance.

Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
---
 kernel/events/core.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -3304,7 +3304,7 @@ static void __pmu_ctx_sched_out(struct p
 		cpc->task_epc = NULL;
 	}
 
-	if (!event_type)
+	if (!(event_type & EVENT_ALL))
 		return;
 
 	perf_pmu_disable(pmu);