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author | Namhyung Kim <namhyung@kernel.org> | 2022-11-18 11:01:09 -0800 |
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committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2022-11-23 10:42:28 -0300 |
commit | c66a36af7ba3a628453da1d91f42ee64fb36ea5a (patch) | |
tree | 291fd932e31f1b2d3ea169601086258259dface7 /tools/perf/util/stat-display.c | |
parent | 7b7c22ccdf275018f715af95b7d052e8d4c6c690 (diff) | |
download | linux-c66a36af7ba3a628453da1d91f42ee64fb36ea5a.tar.bz2 |
perf lock contention: Do not use BPF task local storage
It caused some troubles when a lock inside kmalloc is contended
because task local storage would allocate memory using kmalloc.
It'd create a recusion and even crash in my system.
There could be a couple of workarounds but I think the simplest
one is to use a pre-allocated hash map. We could fix the task
local storage to use the safe BPF allocator, but it takes time
so let's change this until it happens actually.
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Acked-by: Martin KaFai Lau <martin.lau@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Blake Jones <blakejones@google.com>
Cc: Chris Li <chriscli@google.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Song Liu <song@kernel.org>
Cc: bpf@vger.kernel.org
Link: https://lore.kernel.org/r/20221118190109.1512674-1-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/util/stat-display.c')
0 files changed, 0 insertions, 0 deletions