From: Peter Zijlstra <peterz@infradead.org>
To: mingo@kernel.org, acme@kernel.org, linux-kernel@vger.kernel.org
Cc: andi@firstfloor.org, eranian@google.com, jolsa@kernel.org,
torvalds@linux-foundation.org, davidcc@google.com,
alexander.shishkin@linux.intel.com, namhyung@kernel.org,
kan.liang@intel.com, khandual@linux.vnet.ibm.com,
peterz@infradead.org
Subject: [RFC][PATCH 3/7] perf/x86/intel: DCE intel_pmu_lbr_del()
Date: Fri, 08 Jul 2016 15:31:02 +0200 [thread overview]
Message-ID: <20160708134113.450714174@infradead.org> (raw)
In-Reply-To: 20160708133059.031522978@infradead.org
[-- Attachment #1: peterz-perf-frob-lbr-1.patch --]
[-- Type: text/plain, Size: 659 bytes --]
Since pmu::del() is always called under perf_pmu_disable(), the block
conditional on cpuc->enabled is dead.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
---
arch/x86/events/intel/lbr.c | 6 ------
1 file changed, 6 deletions(-)
--- a/arch/x86/events/intel/lbr.c
+++ b/arch/x86/events/intel/lbr.c
@@ -467,12 +467,6 @@ void intel_pmu_lbr_del(struct perf_event
cpuc->lbr_users--;
WARN_ON_ONCE(cpuc->lbr_users < 0);
perf_sched_cb_dec(event->ctx->pmu);
-
- if (cpuc->enabled && !cpuc->lbr_users) {
- __intel_pmu_lbr_disable();
- /* avoid stale pointer */
- cpuc->lbr_context = NULL;
- }
}
void intel_pmu_lbr_enable_all(bool pmi)
next prev parent reply other threads:[~2016-07-08 14:05 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-07-08 13:30 [RFC][PATCH 0/7] perf: Branch stack annotation and fixes Peter Zijlstra
2016-07-08 13:31 ` [RFC][PATCH 1/7] perf/x86/intel: Rework the large PEBS setup code Peter Zijlstra
2016-07-08 16:36 ` Jiri Olsa
2016-07-08 22:00 ` Peter Zijlstra
2016-07-08 22:25 ` Peter Zijlstra
2016-07-10 9:08 ` Jiri Olsa
2016-07-08 13:31 ` [RFC][PATCH 2/7] perf,x86: Ensure perf_sched_cb_{inc,dec}() is only called from pmu::{add,del}() Peter Zijlstra
2016-07-08 13:31 ` Peter Zijlstra [this message]
2016-07-08 13:31 ` [RFC][PATCH 4/7] perf/x86/intel: Remove redundant test from intel_pmu_lbr_add() Peter Zijlstra
2016-07-08 13:31 ` [RFC][PATCH 5/7] perf/x86/intel: Clean up LBR state tracking Peter Zijlstra
2016-07-08 13:31 ` [RFC][PATCH 6/7] perf: Optimize perF_pmu_sched_task() Peter Zijlstra
2016-07-08 13:31 ` [RFC][PATCH 7/7] perf/annotate: Add branch stack / basic block information Peter Zijlstra
2016-07-08 14:55 ` Ingo Molnar
2016-07-08 16:27 ` Peter Zijlstra
2016-07-08 16:36 ` Peter Zijlstra
2016-09-08 16:18 ` Arnaldo Carvalho de Melo
2016-09-08 16:41 ` Peter Zijlstra
2016-09-08 16:51 ` Peter Zijlstra
2016-09-08 17:07 ` Arnaldo Carvalho de Melo
2016-09-08 16:43 ` Stephane Eranian
2016-09-08 16:59 ` Andi Kleen
2016-09-08 17:11 ` Arnaldo Carvalho de Melo
2016-09-09 2:40 ` Jin, Yao
2016-09-08 18:15 ` Peter Zijlstra
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