system_core/logd, branch replicant-6.0

Merge tag 'android-6.0.1_r3' of https://android.googlesource.com/platform/system/core into HEAD

2015-12-08T00:29:46+00:00

Android 6.0.1 release 3

Change-Id: I8b65c0223e3444360432abd871a9d8f007831ba0

Merge tag 'android-6.0.0_r26' into cm-13.0

2015-11-05T18:26:36+00:00

Android 6.0.0 release 26

Change-Id: I93d1e3767cbacab2b18cff360065c91b9eaf1d96

logd: pruning time horizon

2015-11-04T21:00:23+00:00

Estimate a time horizon of ten fold for worst UID pruning

Bug: 25453210
Bug: 24782000
Change-Id: I7118deb6d42531c68ed2ac2a59c57b0580b942cc

logd: optimize code hotspots

2015-11-01T12:29:12+00:00

Discovered that we had a few libc hotspots. Adjust code to generally
reduce or nullify the number of calls to malloc, free, strlen,
strcmp, strncmp, memcmp & strncasecmp. Total gain looks to be about
3% of logd's processing time. malloc still contributes to 3%, but all
others are now total 0.5%.

Bug: 23685592
Change-Id: Ife721121667969260cdb8b055524ae90f5911278

logd: log_strtok_r deal with nuls

2015-11-01T12:29:12+00:00

Rename to log_strntok_r and change from dealing with strings
to dealing with a string and an associated length.

Bug: 23517551
Change-Id: Ia72f1305a53f55eeef9861ac378fb8205fd2378e

logd: Add LogUtils.h

2015-11-01T12:29:12+00:00

Move prototypes from LogBufferElement.h to LogUtils.h

Change-Id: I55e42e17e6c997e35b2b78b87fd2f84f8f393282

logd: klogd deal with nuls in dmesg

2015-11-01T12:29:12+00:00

Switch to using string and length in all transactions, treating
trailing nuls the same as spaces.

ToDo: change dumpstate (bugreport) to use logcat -b printable _regardless_

Bug: 23517551
Change-Id: I42162365e6bf8ed79d356e7b689a673902116fdb

logd: klogd: sniff for time correction on Mediatek

2015-11-01T12:29:12+00:00

Need some more flexibility when parsing kernel messages
cluttered with extra fluff. This is the minimal relaxation
we can do to the rules to ensure that we work on all
possible devices and kernels when sniffing for time
correction information.

We want to minimize any future maintenance, keep in mind
klogd is a "userdebug" or "eng" feature and is disabled
in "user" builds. Manage expectations.

Bug: 23517551
Change-Id: I026d074e14fb2550e728683e85a973bd87e78a9c

logd: klogd and Mediatek part deux

2015-11-01T12:29:12+00:00

- switch to an open coded strnrchr
- validity checking on n, taglen and b values.

Bug: 23517551
Change-Id: I568e25c5aa6d8474835454a0e83b19c2921b7986

logd: klogd and Mediatek

2015-11-01T12:29:12+00:00

- sniff for PID in kernel log messages if available
- properly deal with klogd watermark in face of modified output
- deal more stringently with priority tag, must have [ following
- suppress process-name stutter in tag that can happen
- do not use : to demark tag if within [ ]

Mediatek-special change that adds ()[:]
as a prefix to the printk messages. Along the lines of (simplified
for entertainment purposes, YMMV):

    char tbuf[50]; /* printk prefix */
    int this_cpu = smp_processor_id();
    char state = __raw_get_cpu_var(printk_state);
    unsigned tlen = snprintf(tbuf, sizeof(tbuf), "%c(%x)[%d:%s]",
               state, this_cpu, current->pid, current->comm);

Bug: 23517551
Change-Id: I568e25c5aa6d8474835454a0e83b19c2921b7985