From: Leo Yan <leo.yan@linaro.org>
To: Arnaldo Carvalho de Melo <acme@kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
Adrian Hunter <adrian.hunter@intel.com>,
Ingo Molnar <mingo@redhat.com>,
Mark Rutland <mark.rutland@arm.com>,
Alexander Shishkin <alexander.shishkin@linux.intel.com>,
Jiri Olsa <jolsa@redhat.com>, Namhyung Kim <namhyung@kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
Borislav Petkov <bp@alien8.de>,
x86@kernel.org, "H. Peter Anvin" <hpa@zytor.com>,
Mathieu Poirier <mathieu.poirier@linaro.org>,
Suzuki K Poulose <suzuki.poulose@arm.com>,
Mike Leach <mike.leach@linaro.org>,
linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org,
coresight@lists.linaro.org, linux-arm-kernel@lists.infradead.org
Cc: Leo Yan <leo.yan@linaro.org>
Subject: [PATCH v3 04/10] perf/x86: Add barrier after updating bts
Date: Sun, 4 Jul 2021 15:16:38 +0800 [thread overview]
Message-ID: <20210704071644.107397-5-leo.yan@linaro.org> (raw)
In-Reply-To: <20210704071644.107397-1-leo.yan@linaro.org>
Add barrier wmb() to separate the AUX data store and aux_head store.
Signed-off-by: Leo Yan <leo.yan@linaro.org>
---
arch/x86/events/intel/bts.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/arch/x86/events/intel/bts.c b/arch/x86/events/intel/bts.c
index 6320d2cfd9d3..4a015d160bc5 100644
--- a/arch/x86/events/intel/bts.c
+++ b/arch/x86/events/intel/bts.c
@@ -209,6 +209,9 @@ static void bts_update(struct bts_ctx *bts)
} else {
local_set(&buf->data_size, head);
}
+
+ /* The WMB separates data store and aux_head store matches. */
+ wmb();
}
static int
--
2.25.1
next prev parent reply other threads:[~2021-07-04 7:17 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-04 7:16 [PATCH v3 00/10] perf: Refine barriers for AUX ring buffer Leo Yan
2021-07-04 7:16 ` [PATCH v3 01/10] perf/ring_buffer: Add comment for barriers on " Leo Yan
2021-07-04 7:16 ` [PATCH v3 02/10] coresight: tmc-etr: Add barrier after updating " Leo Yan
2021-07-04 7:16 ` [PATCH v3 03/10] coresight: tmc-etf: Add comment for store ordering Leo Yan
2021-07-04 7:16 ` Leo Yan [this message]
2021-07-04 7:16 ` [PATCH v3 05/10] perf auxtrace: Drop legacy __sync functions Leo Yan
2021-07-10 12:34 ` Adrian Hunter
2021-07-11 7:41 ` Leo Yan
2021-07-04 7:16 ` [PATCH v3 06/10] perf auxtrace: Remove auxtrace_mmap__read_snapshot_head() Leo Yan
2021-07-04 7:16 ` [PATCH v3 07/10] perf: Cleanup for HAVE_SYNC_COMPARE_AND_SWAP_SUPPORT Leo Yan
2021-07-10 12:36 ` Adrian Hunter
2021-07-11 8:08 ` Leo Yan
2021-07-04 7:16 ` [PATCH v3 08/10] perf auxtrace: Use WRITE_ONCE() for updating aux_tail Leo Yan
2021-07-04 7:16 ` [PATCH v3 09/10] perf env: Set kernel bit mode Leo Yan
2021-07-04 7:16 ` [PATCH v3 10/10] perf auxtrace: Add compat_auxtrace_mmap__{read_head|write_tail} Leo Yan
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