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| author | Minchan Kim <minchan@kernel.org> | 2019-02-18 11:11:45 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-02-19 16:50:11 +0300 |
| commit | 3013bf62b67aef921bc2e9ba10e639a022002d02 (patch) | |
| tree | 783ad1e60175ec150ea953276af0f8ab6e8fab49 /tools/perf/scripts/python/export-to-sqlite.py | |
| parent | 7c11df42d0c7bf5b3dd743a21b4872e7b26ca2a2 (diff) | |
| download | linux-3013bf62b67aef921bc2e9ba10e639a022002d02.tar.xz | |
binder: reduce mmap_sem write-side lock
binder has used write-side mmap_sem semaphore to release memory
mapped at address space of the process. However, right lock to
release pages is down_read, not down_write because page table lock
already protects the race for parallel freeing.
Please do not use mmap_sem write-side lock which is well known
contented lock.
Cc: Todd Kjos <tkjos@google.com>
Cc: Martijn Coenen <maco@android.com>
Cc: Arve Hjønnevåg <arve@android.com>
Signed-off-by: Minchan Kim <minchan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'tools/perf/scripts/python/export-to-sqlite.py')
0 files changed, 0 insertions, 0 deletions