system_core/logd/LogReader.cpp, branch replicant-6.0

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: Cleanup

2015-05-13T16:22:56+00:00

(cherry pick from commit 7718778793b106498b931dd708a466cf3a6f6a0f)

- Android Coding Standard for Constructors
- Side effects NONE

Change-Id: I2cda9dd73f3ac3ab58f394015cb810820093d47b

logd: syscall optimization

2015-04-01T19:41:59+00:00

- prset(PR_SET_NAME) call once
- No need to call getuid(), should be AID_LOGD

Change-Id: I4dde0b178bc84e711b355cd7677b0dbf905a0634

logd: replace internal CLOCK_MONOTONIC use with sequence numbers

2015-03-18T19:43:23+00:00

- switch to simpler and faster internal sequence number, drops
  a syscall overhead on 32-bit platforms.
- add ability to break-out of flushTo loop with filter return -1
  allowing in reduction in reader overhead.

Change-Id: Ic5cb2b9afa4d9470153971fc9197b07279e2b79d

logd: in nonblocking read, sched_yield() synchronization

2014-09-29T17:40:10+00:00

- sched_yield and lock synchronization in reader thread
  startup to give writer thread a chance to catch up

Bug: 17512203
Change-Id: I43cf0b4e2829b22b3ab4e537fa95ce13c76a869c

logd: add thread setname

2014-04-29T00:37:37+00:00

- permits easier determination of logd thread at
  fault in a stack trace from debuggerd.

Bug: 14275676
Change-Id: Iac2c523147e2bcce34ab7ddcecd02582c5fa7cc0

logd: libsysutils: logd startup outside init environment

2014-04-17T16:14:24+00:00

Change-Id: I3426b6c3eebdd0c8258e966dcaaaa2825d7a23d1

logd: Find log time for arbitrary time to tail

2014-03-14T17:24:19+00:00

- prototype to evaluate the increase in complexity or
  performance impact.

Change-Id: I4e815d74c023092fbb75055d260f75de57ad6522

logd: liblog: logcat: Arbitrary time to tail

2014-03-14T17:23:51+00:00

Change-Id: I10e8d92c933e31ee11e78d2d1114261a30c4be0e

logd: initial checkin.

2014-02-26T17:52:35+00:00

* Create a new userspace log daemon for handling logging messages.

Original-Change-Id: I75267df16359684490121e6c31cca48614d79856
Signed-off-by: Nick Kralevich 

* Merge conflicts
* rename new syslog daemon to logd to prevent confusion with bionic syslog
* replace racy getGroups call with KISS call to client->getGid()
* Timestamps are filed at logging source
* insert entries into list in timestamp order
* Added LogTimeEntry tail filtration handling
* Added region locking around LogWriter list
* separate threads for each writer
* /dev/socket/logd* permissions

Signed-off-by: Mark Salyzyn 

(cherry picked from commit 3e76e0a49760c4970b7cda6153e51026af98e4f3)

Author: Nick Kralevich 
Change-Id: Ice88b1412d8f9daa7f9119b2b5aaf684a5e28098