From: Leo Yan <leo.yan@linaro.org>
To: Arnaldo Carvalho de Melo <acme@kernel.org>,
Adrian Hunter <adrian.hunter@intel.com>,
Peter Zijlstra <peterz@infradead.org>,
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 v4 00/11] perf: Refine barriers for AUX ring buffer
Date: Sun, 11 Jul 2021 18:40:54 +0800 [thread overview]
Message-ID: <20210711104105.505728-1-leo.yan@linaro.org> (raw)
This patch series is to refine the memory barriers for AUX ring buffer.
Patches 01 ~ 04 to address the barriers usage in the kernel. The first
patch is to make clear comment for how to use the barriers between the
data store and aux_head store, this asks the driver to make sure the
data is visible. Patches 02 ~ 04 is to refine the drivers for barriers
after the data store.
Patch 05 is to use WRITE_ONCE() for updating aux_tail.
Patches 06 ~ 09 is to drop the legacy __sync functions, and polish for
duplicate code and cleanup the build and feature test after
SYNC_COMPARE_AND_SWAP is not used.
Patch 10 introduces a new global variable to indicate the kernel runs in
64-bit mode which can be used to confirm if in compat mode; patch 11
introduces variant functions for accessing AUX head/tail, it resolves
the aotmicity for reading head pointer, and returns error for the tail
is bigger than 4GB.
Have testes the patches on Arm64 Juno platform.
Changes from v3:
- Removed the inapprocate paragraph in the commit log for patch "perf
auxtrace: Drop legacy __sync functions" (Adrian);
- Added new patch to remove feature-sync-compare-and-swap test (Adrian);
- Th patch for "perf auxtrace: Use WRITE_ONCE() for updating aux_tail",
is a standlone and simple change, so moved it ahead in the patch set
for better ordering;
- Minor improvement for commit logs in the last two patches.
Changes from v2:
- Removed auxtrace_mmap__read_snapshot_head(), which has the duplicated
code with auxtrace_mmap__read_head();
- Cleanuped the build for HAVE_SYNC_COMPARE_AND_SWAP_SUPPORT (Adrian);
- Added global variable "kernel_is_64_bit" (Adrian);
- Added compat variants compat_auxtrace_mmap__{read_head|write_tail}
(Adrian).
Leo Yan (11):
perf/ring_buffer: Add comment for barriers on AUX ring buffer
coresight: tmc-etr: Add barrier after updating AUX ring buffer
coresight: tmc-etf: Add comment for store ordering
perf/x86: Add barrier after updating bts
perf auxtrace: Use WRITE_ONCE() for updating aux_tail
perf auxtrace: Drop legacy __sync functions
perf auxtrace: Remove auxtrace_mmap__read_snapshot_head()
perf: Cleanup for HAVE_SYNC_COMPARE_AND_SWAP_SUPPORT
tools: Remove feature-sync-compare-and-swap feature detection
perf env: Set flag for kernel is 64-bit mode
perf auxtrace: Add compat_auxtrace_mmap__{read_head|write_tail}
arch/x86/events/intel/bts.c | 3 +
.../hwtracing/coresight/coresight-tmc-etf.c | 6 +
.../hwtracing/coresight/coresight-tmc-etr.c | 8 ++
kernel/events/ring_buffer.c | 9 ++
tools/build/Makefile.feature | 1 -
tools/build/feature/Makefile | 4 -
tools/build/feature/test-all.c | 4 -
.../feature/test-sync-compare-and-swap.c | 15 ---
tools/perf/Makefile.config | 4 -
tools/perf/util/auxtrace.c | 19 ++-
tools/perf/util/auxtrace.h | 109 ++++++++++++++----
tools/perf/util/env.c | 17 ++-
tools/perf/util/env.h | 1 +
13 files changed, 136 insertions(+), 64 deletions(-)
delete mode 100644 tools/build/feature/test-sync-compare-and-swap.c
--
2.25.1
next reply other threads:[~2021-07-11 10:41 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-11 10:40 Leo Yan [this message]
2021-07-11 10:40 ` [PATCH v4 01/11] perf/ring_buffer: Add comment for barriers on AUX ring buffer Leo Yan
2021-07-11 10:40 ` [PATCH v4 02/11] coresight: tmc-etr: Add barrier after updating " Leo Yan
2021-07-12 10:40 ` Suzuki K Poulose
2021-07-12 10:54 ` Leo Yan
2021-07-11 10:40 ` [PATCH v4 03/11] coresight: tmc-etf: Add comment for store ordering Leo Yan
2021-07-13 12:56 ` Peter Zijlstra
2021-07-13 15:49 ` Leo Yan
2021-07-11 10:40 ` [PATCH v4 04/11] perf/x86: Add barrier after updating bts Leo Yan
2021-07-13 13:01 ` Peter Zijlstra
2021-07-11 10:40 ` [PATCH v4 05/11] perf auxtrace: Use WRITE_ONCE() for updating aux_tail Leo Yan
2021-07-11 10:41 ` [PATCH v4 06/11] perf auxtrace: Drop legacy __sync functions Leo Yan
2021-07-11 10:41 ` [PATCH v4 07/11] perf auxtrace: Remove auxtrace_mmap__read_snapshot_head() Leo Yan
2021-07-12 14:32 ` Adrian Hunter
2021-07-13 13:10 ` Leo Yan
2021-07-11 10:41 ` [PATCH v4 08/11] perf: Cleanup for HAVE_SYNC_COMPARE_AND_SWAP_SUPPORT Leo Yan
2021-07-11 10:41 ` [PATCH v4 09/11] tools: Remove feature-sync-compare-and-swap feature detection Leo Yan
2021-07-11 10:41 ` [PATCH v4 10/11] perf env: Set flag for kernel is 64-bit mode Leo Yan
2021-07-12 14:37 ` Adrian Hunter
2021-07-12 18:14 ` Arnaldo Carvalho de Melo
2021-07-13 15:09 ` Leo Yan
2021-07-13 17:31 ` Hunter, Adrian
2021-07-14 13:59 ` Arnaldo Carvalho de Melo
2021-07-14 14:00 ` Arnaldo Carvalho de Melo
2021-07-23 7:11 ` Leo Yan
2021-07-11 10:41 ` [PATCH v4 11/11] perf auxtrace: Add compat_auxtrace_mmap__{read_head|write_tail} Leo Yan
2021-07-12 14:44 ` Russell King (Oracle)
2021-07-13 15:46 ` Leo Yan
2021-07-13 16:14 ` Russell King (Oracle)
2021-07-13 18:13 ` Catalin Marinas
2021-07-14 8:40 ` Russell King (Oracle)
2021-07-23 7:23 ` Leo Yan
2021-07-13 7:07 ` Adrian Hunter
2021-07-13 15:48 ` Leo Yan
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