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[ Upstream commitf1f96511b1] Currently cpu-clock event always returns 0 count, e.g., perf stat -e cpu-clock -- sleep 1 Performance counter stats for 'sleep 1': 0 cpu-clock # 0.000 CPUs utilized 1.002308394 seconds time elapsed The root cause is the commit 'bc4394e5e79c ("perf: Fix the throttle error of some clock events")' adds PERF_EF_UPDATE flag check before calling cpu_clock_event_update() to update the count, however the PERF_EF_UPDATE flag is never set when the cpu-clock event is stopped in counting mode (pmu->dev() -> cpu_clock_event_del() -> cpu_clock_event_stop()). This leads to the cpu-clock event count is never updated. To fix this issue, force to set PERF_EF_UPDATE flag for cpu-clock event just like what task-clock does. Fixes:bc4394e5e7("perf: Fix the throttle error of some clock events") Signed-off-by: Dapeng Mi <dapeng1.mi@linux.intel.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Reviewed-by: Ian Rogers <irogers@google.com> Acked-by: Namhyung Kim <namhyung@kernel.org> Link: https://patch.msgid.link/20251112080526.3971392-1-dapeng1.mi@linux.intel.com Signed-off-by: Sasha Levin <sashal@kernel.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.