Add private function __android_logger_get_buffer_size() to read
properties and compose the default buffer size. This interface
complements the existing android_looger_get_size() which returns
the logd setting which can differ at runtime. For use in logd
and dumpstate. Side effect is we also add the private functions
__android_logger_property_get_bool() and
__android_logger_valid_buffer_size() for reuse in logd.
Test: gTest liblog-unit-test, logd-unit-tests and logcat-unit-tests in
combination with commit 'logd: Use private interfaces for
buffer size properties'
Bug: 31750617
Change-Id: Id95cb68f775ef6b427c122e10f6f8291d336d184
Allow our own libraries to use this privately instead of
running the less efficient get_properties and doing the math.
Test: compile and boot smoke test
Bug: 27566046
Bug: 31456426
Change-Id: I2f677276d27fbcb6af01b600ac1d9891c8938d43
Allows us to mitigate the impact of MAP_PRIVATE and copy on write by
calling android_lookupEventTag_len instead of android_lookupEventTag,
and delaying the copy on write impact to the later. We return a
string length in a supplied location along with the string pointer
with android_lookupEventTag_len(const EventTagMap* map, size_t* len,
int tag). The string is not guaranteed to be nul terminated. Since
android_lookupEventTag() called even once can cause the memory
impact, we will mark it as deprecated, but we currently have no
timeframe for removal since this is a very old interface.
Add an API for __android_log_is_loggable_len() that accepts the non
null terminated content and fixup callers that would gain because the
length is known prior to the call either in the compiler or at
runtime. Tackle transition to android_lookupEventTag_len() and
fixup callers.
On any application that performs logging (eg: com.android.phone)
/proc/<pid>/smaps before:
xxxxxxxxxx-xxxxxxxxxx rw-p 00000000 fd:00 463 /system/etc/event-log-tags
Size: 20 kB
Rss: 20 kB
Pss: 1 kB
Shared_Clean: 0 kB
Shared_Dirty: 20 kB
Private_Clean: 0 kB
Private_Dirty: 0 kB
Referenced: 0 kB
Anonymous: 20 kB
AnonHugePages: 0 kB
Swap: 0 kB
SwapPss: 0 kB
KernelPageSize: 4 kB
MMUPageSize: 4 kB
Locked: 0 kB
VmFlags: rd wr mr mw me ac
/proc/<pid>/smaps after:
xxxxxxxxxx-xxxxxxxxxx rw-p 00000000 fd:00 1773 /system/etc/event-log-tags
Size: 20 kB
Rss: 20 kB
Pss: 1 kB
Shared_Clean: 20 kB (was 0kB)
Shared_Dirty: 0 kB (was 20kB)
Private_Clean: 0 kB
Private_Dirty: 0 kB
Referenced: 20 kB (was 0kB)
Anonymous: 0 kB (was 20kB)
AnonHugePages: 0 kB
Swap: 0 kB
SwapPss: 0 kB
KernelPageSize: 4 kB
MMUPageSize: 4 kB
Locked: 0 kB
VmFlags: rd wr mr mw me ac
Added liblog-unit-tests --gtest_filter=liblog.event_log_tags to
check for Shared_Clean: to not be 0 and Anonymous: to be 0 for
all processes referencing event-log-tags. Which can include multiple
references to /system/etc/event-log-tags and future possible refs to
/data/misc/logd/event-log-tags and /dev/event-log-tags. We want
failure messages to help point to errant code using the deprecated
interface.
This change saves 1/4MB of memory or more on a typical system.
Test: gTest liblog-unit-tests
Bug: 31456426
Change-Id: I9e08e44d9092bd96fe704b5709242e7195281d33
- periodic failures in apct, dropped second serial test
in refresh_cache, trusting check_cache or global.
- The retry loop to see if is_loggable recovers of 1000
was hiding subsequent tests, drop to 10 retries.
- On the whole, the average performance remains the same.
Bug: 25792367
Change-Id: I4110440ef46671d7a1c128689bde623808bed04f
- add optimized & cached LIBLOG_HIDDEN __android_log_is_debuggable()
- check when writing, either LOG_ID_SECURITY, SafetyNet or
debuggable when pushing content to the pmsg buffer.
Bug: 27566046
Change-Id: I85f1b55ec329b38e00f4183836b6ed53046c323d
Create config_logger, logger and logger_read to house the log
interfaces. Add fake_logger, logd_logger and pmsg_logger to
house the write and read transports. Allows for an easier and
direct path to add new transports to the library.
SideEffects: None, logger benchmark performance unaffected
Bug: 27176738
Bug: 27405083
Change-Id: I01b38637334a5242905c8c89f6ab0a92e2540008
- replace <sys/cdefs.h> with local "log_cdefs.h" which
fortifies and expands definitions, adding LIBLOG_ABI_PUBLIC,
LIBLOG_HIDDEN, LIBLOG_ABI_PRIVATE and LIBLOG_WEAK.
- clearly tag each interface as LIBLOG_ABI_PUBLIC, LIBLOG_HIDDEN,
LIBLOG_ABI_PRIVATE, LIBLOG_WEAK or static depending on scope
- Add -fvisibility=hidden to ensure nothing else leaks
- some code standard adjustments
Bug: 27566046
Change-Id: Ic14033c4e6d833d973beb035ddc1c6134fb35a3f
strdup to a static pointer is unnecessary, strlcpy into a static buffer
instead. Avoids allocations in the ALOG* path, allowing liblog to be
used by libmemleak.
Change-Id: Ie0986da27c1fc5eb8ce4ebb076b513be8e1ee676
Some compilers erroneously see uninitialized use, even despite all
accesses being behind !not_locked. Confirmed initialization does not
affect expected performance.
Bug: 26178938
Bug: 26029733
Bug: 17760225
Change-Id: Ib36ed8dd2c4b196ca84ef79a9531625dcee77e15
- 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
Return non-zero if ro.device_owner is set and not false
and persist.logd.security is true.
Bug: 26029733
Change-Id: Ie82ae11ae35e9c79017b6e873fefb39d79a1d4fe
android_log_timestamp returns the property leading letter,
it is better to return a clockid_t with android_log_clockid()
Bug: 23668800
Change-Id: I38dee773bf3844177826b03a26b03215c79a5359
android_log_timestamp returns the property leading letter,
it is better to return a clockid_t with android_log_clockid()
Bug: 23668800
Change-Id: I3c4e3e6b87f6676950797f1f0e203b44c542ed43
Although ever present, an increased regression introduced with
commit b6bee33182 (liblog: logd:
support logd.timestamp = monotonic).
A signal handler can interrupt in locked context, if log is written
in the signal handler, we are in deadlock. To reduce the contention
and chances for this problem separate out timestamp lock from is
loggable lock to reduce contention situations. Provide a best-guess
response if lock would fail in timestamp path.
Use a common lock() inline within each module, with a comment speaking
to the issues surrounding calling a function that has a mutex within
a signal handler.
ToDo: Hold off signals temporarily in mainline, restart when unblock.
Can not use pthread_sigmask(SIG_BLOCK,,) as it breaks AtCmd.
Signed-off-by: Mark Salyzyn <salyzyn@google.com>
Bug: 25563384
Change-Id: I47e2c87c988c3e359eb9eef129c6a3a08e9eedef
Although ever present, an increased regression introduced with
commit b6bee33182 (liblog: logd:
support logd.timestamp = monotonic).
A signal handler can interrupt in locked context, if log is written
in the signal handler, we are in deadlock. Block signals while we
are locked. Separate out timestamp lock from is loggable lock to
reduce contention situations. Provide a best-guess response if
lock would fail in timestamp path.
Bug: 25563384
Change-Id: I6dccd6b99ebace1c473c03a785a35c63ed5c6a8a
strcmp was 1/10 #2 behind find_property in __android_log_level(),
now virtually eliminated from performance profile.
Bug: 23685592
Change-Id: I3978886193af77e489c6d1728d6a26b7f53f8f2f
- Add support for "log.tag" and "persist.log.tag" global
logging properties, effectively a runtime default minimum
logging level.
- Add a thread-safe single level cache plus selective logic for the
four properties being checked to help speed up logging decision
on subsequent identical calls.
- Using new __system_property_area_serial() to make for
efficient (<100ns) handling of cache misses. Despite adding
two new properties, we are 8 times faster on subsequent calls
even if the properties do not exist.
- A NULL or blank tag is no longer directed to return default,
it will check the pair of global logging properties first.
- Add liblog.is_loggable gTest
- Fixup liblog.android_logger_get_, allow no content in crash buffer
- Fixup liblog.max_payload, lowered logd priority increases latency
Bug: 19544788
Bug: 21696721
Change-Id: Ideb887755aa3f1fd14a2603bda1fe23cba49642c
- If logd.tag.<tag> is not found, check if persist.logd.tag.<tag> is available
- Do not turn off the isLoggable functionality on "user" builds
Bug: 19544788
Bug: 17760225
Change-Id: I3fec67b547aa431438965519507033798398e1e1
- Add new liblog API __android_log_is_loggable(prio, tag, def)
- future plan to integrate this into the runtime checks and into
the logd daemon for filtration. Inert for now.
Bug: 17760225
Change-Id: I16395b4d42acc08f0209f55a1cbf87b0b2112898
