From: Andrii Nakryiko <andrii@kernel.org>
To: x86@kernel.org, peterz@infradead.org, mingo@redhat.com,
tglx@linutronix.de
Cc: bpf@vger.kernel.org, linux-kernel@vger.kernel.org,
jolsa@kernel.org, song@kernel.org, kernel-team@meta.com,
Andrii Nakryiko <andrii@kernel.org>
Subject: [PATCH v5 0/4] perf/x86/amd: add LBR capture support outside of hardware events
Date: Mon, 1 Apr 2024 19:21:14 -0700 [thread overview]
Message-ID: <20240402022118.1046049-1-andrii@kernel.org> (raw)
Add AMD-specific implementation of perf_snapshot_branch_stack static call that
allows LBR capture from arbitrary points in the kernel. This is utilized by
BPF programs. See patch #3 for all the details.
Patches #1 and #2 are preparatory steps to ensure LBR freezing is completely
inlined and have no branches, to minimize LBR snapshot contamination.
Patch #4 removes an artificial restriction on perf events with LBR enabled.
v4->v5:
- rebased on top of perf/urgent branch to resolve conflicts with
598c2fafc06f ("perf/x86/amd/lbr: Use freeze based on availability").
Andrii Nakryiko (4):
perf/x86/amd: ensure amd_pmu_core_disable_all() is always inlined
perf/x86/amd: avoid taking branches before disabling LBR
perf/x86/amd: support capturing LBR from software events
perf/x86/amd: don't reject non-sampling events with configured LBR
arch/x86/events/amd/core.c | 37 +++++++++++++++++++++++++++++++++++-
arch/x86/events/amd/lbr.c | 13 +------------
arch/x86/events/perf_event.h | 13 +++++++++++++
3 files changed, 50 insertions(+), 13 deletions(-)
--
2.43.0
next reply other threads:[~2024-04-02 2:21 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-04-02 2:21 Andrii Nakryiko [this message]
2024-04-02 2:21 ` [PATCH v5 1/4] perf/x86/amd: ensure amd_pmu_core_disable_all() is always inlined Andrii Nakryiko
2024-04-02 2:21 ` [PATCH v5 2/4] perf/x86/amd: avoid taking branches before disabling LBR Andrii Nakryiko
2024-04-02 2:21 ` [PATCH v5 3/4] perf/x86/amd: support capturing LBR from software events Andrii Nakryiko
2024-04-02 2:21 ` [PATCH v5 4/4] perf/x86/amd: don't reject non-sampling events with configured LBR Andrii Nakryiko
2024-04-03 7:19 ` [PATCH v5 0/4] perf/x86/amd: add LBR capture support outside of hardware events Ingo Molnar
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