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[71.34.16.191]) by smtp.gmail.com with ESMTPSA id 6a1803df08f44-91c47c4c6besm9448136d6.23.2026.10.23.18.56.19 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 23 Oct 2026 18:56:19 -0700 (PDT) From: Crystal Wood To: Steven Rostedt Cc: Tomas Glozar , John Kacur , linux-trace-kernel@vger.kernel.org, Crystal Wood Subject: [PATCH v5 0/9] tracing/osnoise: Synchronization fixes Date: Fri, 23 Oct 2026 20:56:06 -0500 Message-ID: <20261024015614.3095251-1-crwood@redhat.com> X-Mailer: git-send-email 2.56.0 X-Mailing-List: linux-trace-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: z83mY5cVsd9JEvBxVSAqNllkJ5CmQpdHwNbb3y9uOlw_1792806981 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: 8bit content-type: text/plain; charset="US-ASCII"; x-default=true Various improvements to synchronization in osnoise/timerlat. v5: - Removed "Split out per-cpu variable resets" due to Sashiko feedback about races with NMIs and other tracing hooks; the main motivation for that patch was problems with osn->sampling and tlat->thread, both of which are now explicitly cleared. - Fixed some patch shuffling bugs in fd detachment that were revealed by dropping the reset patch - Added "Start all eligible cpus from hotplug workfn" - Removed "Always check OSN_WORKLOAD" which is no longer needed after the hotplug workfn patch v4: fixed a problem with the v3 fix spotted by Sashiko https://lore.kernel.org/all/20261014220759.908839-1-crwood@redhat.com/ v3: make sure osn->sampling gets cleared on stop, even for non-workload osnoise (reported by Sashiko) https://lore.kernel.org/all/20261014022640.695786-1-crwood@redhat.com/ v2: addresses issues raised by Sashiko, as well as a few more problems discovered in additional testing. https://lore.kernel.org/all/20261010022338.2507589-1-crwood@redhat.com/ v1: https://lore.kernel.org/all/20260824211544.3984835-1-crwood@redhat.com/ Crystal Wood (8): tracing/osnoise: Variable cleanup tracing/osnoise: Start all eligible cpus from hotplug workfn tracing/osnoise: Hold a ref on osn->kthread tracing/osnoise: Per-cpu mutexes and fd detachment tracing/osnoise: kthreads: Verify CPU after migrate_disable() tracing/osnoise: Take trace_types_lock in timerlat_fd_open tracing/osnoise: Print taint message for timerlat tracing/osnoise: Refuse timerlat fd open if tracer inactive Documentation/trace/timerlat-tracer.rst | 5 +- kernel/trace/trace_osnoise.c | 395 +++++++++++++++--------- 2 files changed, 246 insertions(+), 154 deletions(-) -- 2.54.0