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| author | Mark Salyzyn <salyzyn@google.com> | 2015-12-21 12:32:48 -0800 |
|---|---|---|
| committer | Mark Salyzyn <salyzyn@google.com> | 2015-12-22 10:06:22 -0800 |
| commit | a67d8a53c744b4e873f666541b1854c704994da9 (patch) | |
| tree | 07112a020d097bdac0149556b92510d42e73c84a /base/errors_unix.cpp | |
| parent | 8a1b764db9ea1681191662ea343c7598707d3510 (diff) | |
liblog: is loggable is flaky
- Deal with __android_log_is_loggable inside signal handler by
treating a lock contention system call as more costly than reading
the associated property directly. Rather waiting around in a
contended stat to hit cache.
- Check both the individual known __system_property_serial() and
global __system_property_area_serial() to detect updates or
additions to the properties to respond in the most aggressive and
timely manner. __android_log_is_loggable() return at max CPU
clockrate on a N9 in 61ns.
- Craft a common do_cache2 inline that adds the above to the other
functions that utilize cache handling and preserves (within 3ns)
performance in android_log_clockid() and __android_log_security().
These functions return at max CPU clockrate on a N9 in 23ns.
Bug: 19544788
Bug: 25693940
Bug: 25792367
Bug: 26178938
Change-Id: I9cd94598f5c558e946b93977ad3714a4b03d0422
Diffstat (limited to 'base/errors_unix.cpp')
0 files changed, 0 insertions, 0 deletions