From: sashiko-bot@kernel.org
To: "Leo Yan" <leo.yan@arm.com>
Cc: linux-perf-users@vger.kernel.org
Subject: Re: [PATCH v2 02/14] perf intel-pt: Preserve return addresses for asynchronous branches
Date: Wed, 23 Sep 2026 15:43:22 +0000 [thread overview]
Message-ID: <20260923154322.ED1481F000FF@smtp.kernel.org> (raw)
In-Reply-To: <20260923-perf_cs_etm_fix_non_taken-v2-2-6ab8c07a5455@arm.com>
> Intel PT uses a zero instruction length for asynchronous branches so
> the thread stack resumes at the source IP. A dlfilter can fetch the
> instruction before call/return processing and replace that zero with
> its opcode length, advancing the saved return address.
>
> Set sample.ret_addr to sample.ip for asynchronous branch samples so
> instruction fetching cannot change the return address. This also
> covers asynchronous trace-end samples and VM exits.
>
> Assisted-by: Codex:gpt-6
> Signed-off-by: Leo Yan <leo.yan@arm.com>
Sashiko has reviewed this patch and found no issues. It looks great!
--
Sashiko AI review · https://sashiko.dev/#/patchset/20260923-perf_cs_etm_fix_non_taken-v2-0-6ab8c07a5455@arm.com?part=2
next prev parent reply other threads:[~2026-09-23 15:43 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-23 15:21 [PATCH v2 00/14] perf cs-etm: Fix bogus branch samples on exceptions Leo Yan
2026-09-23 15:21 ` [PATCH v2 01/14] perf sample: Allow decoders to supply branch return addresses Leo Yan
2026-09-23 15:29 ` sashiko-bot
2026-09-24 13:00 ` Adrian Hunter
2026-09-23 15:21 ` [PATCH v2 02/14] perf intel-pt: Preserve return addresses for asynchronous branches Leo Yan
2026-09-23 15:43 ` sashiko-bot [this message]
2026-09-24 13:00 ` Adrian Hunter
2026-09-23 15:21 ` [PATCH v2 03/14] perf cs-etm: Break branch history when instruction memory is unavailable Leo Yan
2026-09-23 15:46 ` sashiko-bot
2026-09-23 15:21 ` [PATCH v2 04/14] perf cs-etm: Centralize packet ISA initialization Leo Yan
2026-09-23 15:50 ` sashiko-bot
2026-09-23 15:21 ` [PATCH v2 05/14] perf cs-etm: Use the recorded instruction size for A32 and A64 Leo Yan
2026-09-23 16:01 ` sashiko-bot
2026-09-29 13:55 ` James Clark
2026-09-23 15:21 ` [PATCH v2 06/14] perf cs-etm: Mark branches that were not taken Leo Yan
2026-09-23 16:09 ` sashiko-bot
2026-09-23 15:21 ` [PATCH v2 07/14] perf cs-etm: Factor out final instruction sample synthesis Leo Yan
2026-09-23 16:13 ` sashiko-bot
2026-09-23 15:21 ` [PATCH v2 08/14] perf cs-etm: Centralize branch sample synthesis checks Leo Yan
2026-09-23 16:18 ` sashiko-bot
2026-09-23 15:21 ` [PATCH v2 09/14] perf cs-etm: Classify exception calls using the exception packet Leo Yan
2026-09-23 16:24 ` sashiko-bot
2026-09-29 14:08 ` James Clark
2026-09-23 15:21 ` [PATCH v2 10/14] perf cs-etm: Synthesize exception entries separately from branches Leo Yan
2026-09-23 16:36 ` sashiko-bot
2026-09-23 15:21 ` [PATCH v2 11/14] perf tests: Check CoreSight IRQ entry and exit Leo Yan
2026-09-23 16:40 ` sashiko-bot
2026-09-29 12:22 ` James Clark
2026-09-23 15:21 ` [PATCH v2 12/14] perf tests: Check CoreSight syscall " Leo Yan
2026-09-23 16:46 ` sashiko-bot
2026-09-23 15:21 ` [PATCH v2 13/14] perf tests: Check CoreSight abort " Leo Yan
2026-09-23 16:49 ` sashiko-bot
2026-09-23 15:21 ` [PATCH v2 14/14] perf tests: Check CoreSight emulated instruction " Leo Yan
2026-09-23 16:56 ` sashiko-bot
2026-09-29 14:41 ` [PATCH v2 00/14] perf cs-etm: Fix bogus branch samples on exceptions James Clark
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