From: Arnaldo Carvalho de Melo <acme@kernel.org> To: James Clark <james.clark@arm.com> Cc: linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org, broonie@kernel.org, german.gomez@arm.com, leo.yan@linaro.org, mathieu.poirier@linaro.org, john.garry@huawei.com, Will Deacon <will@kernel.org>, Mike Leach <mike.leach@linaro.org>, 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@kernel.org>, Namhyung Kim <namhyung@kernel.org>, linux-arm-kernel@lists.infradead.org Subject: Re: [PATCH v2 0/2] perf: arm64: Tools support for Dwarf unwinding through SVE functions Date: Tue, 17 May 2022 11:58:38 -0300 [thread overview] Message-ID: <YoO4Hiue7PmJ9KOS@kernel.org> (raw) In-Reply-To: <20220517102005.3022017-1-james.clark@arm.com> Em Tue, May 17, 2022 at 11:20:01AM +0100, James Clark escreveu: > Changes since v1: > > * Split patchset into kernel side and Perf tool changes Thanks, now I'll wait for the kernel side to be merged. - Arnaldo > When SVE registers are pushed onto the stack the VG register is required to > unwind because the stack offsets would vary by the SVE register width at the > time when the sample was taken. > > The patches ("[PATCH v2 0/2] perf: arm64: Kernel support for Dwarf unwinding > through SVE functions") add support for sampling the VG register to the kernel > and the docs. This is the patchset to add support to userspace perf. > > A small change is also required to libunwind or libdw depending on which > unwinder is used, and these will be published later. Without these changes Perf > continues to work with both libraries, although the VG register is still not > used for unwinding. > > Thanks > James > > James Clark (4): > perf tools: arm64: Copy perf_regs.h from the kernel > perf tools: Use dynamic register set for Dwarf unwind > perf tools: arm64: Decouple Libunwind register names from Perf > perf tools: arm64: Add support for VG register > > tools/arch/arm64/include/uapi/asm/perf_regs.h | 7 +- > tools/perf/arch/arm64/util/perf_regs.c | 34 +++++++++ > tools/perf/arch/arm64/util/unwind-libunwind.c | 73 +------------------ > tools/perf/util/evsel.c | 2 +- > tools/perf/util/perf_regs.c | 2 + > 5 files changed, 45 insertions(+), 73 deletions(-) > > -- > 2.28.0 -- - Arnaldo
WARNING: multiple messages have this Message-ID (diff)
From: Arnaldo Carvalho de Melo <acme@kernel.org> To: James Clark <james.clark@arm.com> Cc: linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org, broonie@kernel.org, german.gomez@arm.com, leo.yan@linaro.org, mathieu.poirier@linaro.org, john.garry@huawei.com, Will Deacon <will@kernel.org>, Mike Leach <mike.leach@linaro.org>, 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@kernel.org>, Namhyung Kim <namhyung@kernel.org>, linux-arm-kernel@lists.infradead.org Subject: Re: [PATCH v2 0/2] perf: arm64: Tools support for Dwarf unwinding through SVE functions Date: Tue, 17 May 2022 11:58:38 -0300 [thread overview] Message-ID: <YoO4Hiue7PmJ9KOS@kernel.org> (raw) In-Reply-To: <20220517102005.3022017-1-james.clark@arm.com> Em Tue, May 17, 2022 at 11:20:01AM +0100, James Clark escreveu: > Changes since v1: > > * Split patchset into kernel side and Perf tool changes Thanks, now I'll wait for the kernel side to be merged. - Arnaldo > When SVE registers are pushed onto the stack the VG register is required to > unwind because the stack offsets would vary by the SVE register width at the > time when the sample was taken. > > The patches ("[PATCH v2 0/2] perf: arm64: Kernel support for Dwarf unwinding > through SVE functions") add support for sampling the VG register to the kernel > and the docs. This is the patchset to add support to userspace perf. > > A small change is also required to libunwind or libdw depending on which > unwinder is used, and these will be published later. Without these changes Perf > continues to work with both libraries, although the VG register is still not > used for unwinding. > > Thanks > James > > James Clark (4): > perf tools: arm64: Copy perf_regs.h from the kernel > perf tools: Use dynamic register set for Dwarf unwind > perf tools: arm64: Decouple Libunwind register names from Perf > perf tools: arm64: Add support for VG register > > tools/arch/arm64/include/uapi/asm/perf_regs.h | 7 +- > tools/perf/arch/arm64/util/perf_regs.c | 34 +++++++++ > tools/perf/arch/arm64/util/unwind-libunwind.c | 73 +------------------ > tools/perf/util/evsel.c | 2 +- > tools/perf/util/perf_regs.c | 2 + > 5 files changed, 45 insertions(+), 73 deletions(-) > > -- > 2.28.0 -- - Arnaldo _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2022-05-17 14:58 UTC|newest] Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top 2022-05-17 10:20 [PATCH v2 0/2] perf: arm64: Tools support for Dwarf unwinding through SVE functions James Clark 2022-05-17 10:20 ` James Clark 2022-05-17 10:20 ` [PATCH v2 1/4] perf tools: arm64: Copy perf_regs.h from the kernel James Clark 2022-05-17 10:20 ` James Clark 2022-05-17 10:50 ` Leo Yan 2022-05-17 10:50 ` Leo Yan 2022-05-17 10:20 ` [PATCH v2 2/4] perf tools: Use dynamic register set for Dwarf unwind James Clark 2022-05-17 10:20 ` James Clark 2022-05-17 11:03 ` Leo Yan 2022-05-17 11:03 ` Leo Yan 2022-05-18 13:25 ` James Clark 2022-05-18 13:25 ` James Clark 2022-05-18 14:00 ` Leo Yan 2022-05-18 14:00 ` Leo Yan 2022-05-17 10:20 ` [PATCH v2 3/4] perf tools: arm64: Decouple Libunwind register names from Perf James Clark 2022-05-17 10:20 ` James Clark 2022-05-17 12:54 ` Leo Yan 2022-05-17 12:54 ` Leo Yan 2022-05-17 10:20 ` [PATCH v2 4/4] perf tools: arm64: Add support for VG register James Clark 2022-05-17 10:20 ` James Clark 2022-05-17 13:19 ` Leo Yan 2022-05-17 13:19 ` Leo Yan 2022-05-18 9:44 ` James Clark 2022-05-18 9:44 ` James Clark 2022-05-18 9:57 ` Leo Yan 2022-05-18 9:57 ` Leo Yan 2022-05-17 14:58 ` Arnaldo Carvalho de Melo [this message] 2022-05-17 14:58 ` [PATCH v2 0/2] perf: arm64: Tools support for Dwarf unwinding through SVE functions Arnaldo Carvalho de Melo 2022-05-20 11:46 ` German Gomez 2022-05-20 11:46 ` German Gomez 2022-05-20 12:32 ` Arnaldo Carvalho de Melo 2022-05-20 12:32 ` Arnaldo Carvalho de Melo 2022-05-20 14:52 ` James Clark 2022-05-20 14:52 ` James Clark
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