From: sashiko-bot@kernel.org
To: "Arnaldo Carvalho de Melo" <acme@kernel.org>
Cc: linux-perf-users@vger.kernel.org
Subject: Re: [PATCH 9/9] perf mem record: Use the IBS swfilt filter when available
Date: Mon, 14 Sep 2026 14:15:04 +0000 [thread overview]
Message-ID: <20260914141504.B9B441F000FF@smtp.kernel.org> (raw)
In-Reply-To: <20260914125451.2045-10-acme@kernel.org>
> From: Arnaldo Carvalho de Melo <acme@redhat.com>
>
> IBS events with exclude_{user,kernel} bits, as used in per-thread mode
> when kernel samples are not allowed, are rejected by the kernel on
> hardware without the privilege filter, so a per-thread 'perf mem
> record' fails:
>
> $ perf mem record -o /dev/null -- true
> Error:
> Failure to open event 'ibs_op/ldlat=0/u' on PMU 'ibs_op' which will be removed.
> Invalid event (ibs_op/ldlat=0/u) in per-thread mode, enable system wide with '-a'.
>
> Kernel v6.14 added swfilt, a software privilege filter that makes those
> events usable per-thread, exposed as the 'swfilt' format term
> (d29e744c71673a71 "perf/x86: Relax privilege filter restriction on AMD
> [ ... ]
> ldlat=150.
>
> Suggested-by: Namhyung Kim <namhyung@kernel.org>
> Assisted-by: LLM
> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Sashiko has reviewed this patch and found no issues. It looks great!
--
Sashiko AI review · https://sashiko.dev/#/patchset/20260914125451.2045-1-acme@kernel.org?part=9
prev parent reply other threads:[~2026-09-14 14:15 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-14 12:54 [PATCH v5 0/9] perf tools: Annotate fixes, stdio progress indication, debuginfo-client in more places Arnaldo Carvalho de Melo
2026-09-14 12:54 ` [PATCH 1/9] perf test: Skip data_type_profiling when the PMU cannot record memory events Arnaldo Carvalho de Melo
2026-09-14 13:00 ` sashiko-bot
2026-09-14 12:54 ` [PATCH 2/9] perf debuginfo: Fetch debuginfo keyed by build ID using debuginfod Arnaldo Carvalho de Melo
2026-09-14 13:07 ` sashiko-bot
2026-09-14 12:54 ` [PATCH 3/9] perf symbol: Fall back to fetching the vmlinux by build ID Arnaldo Carvalho de Melo
2026-09-14 13:18 ` sashiko-bot
2026-09-14 12:54 ` [PATCH 4/9] perf annotate-data: Show the sample count in the data-type browser Arnaldo Carvalho de Melo
2026-09-14 13:24 ` sashiko-bot
2026-09-14 12:54 ` [PATCH 5/9] perf report: Add --progress option Arnaldo Carvalho de Melo
2026-09-14 13:37 ` sashiko-bot
2026-09-14 12:54 ` [PATCH 6/9] perf scripts: Add perf-stuck, to tell where a running perf is stuck Arnaldo Carvalho de Melo
2026-09-14 13:44 ` sashiko-bot
2026-09-14 12:54 ` [PATCH 7/9] perf annotate-data: Resolve type DIEs in the debug file they came from Arnaldo Carvalho de Melo
2026-09-14 13:54 ` sashiko-bot
2026-09-14 12:54 ` [PATCH 8/9] perf mem record: Request PERF_SAMPLE_CPU by default Arnaldo Carvalho de Melo
2026-09-14 14:11 ` sashiko-bot
2026-09-14 12:54 ` [PATCH 9/9] perf mem record: Use the IBS swfilt filter when available Arnaldo Carvalho de Melo
2026-09-14 14:15 ` sashiko-bot [this message]
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