glusterfs.git/xlators/performance/io-threads/src/io-threads.h, branch v3.2.0qa8

io-threads: implement bulk and priority queues

2011-02-22T10:11:10+00:00

Signed-off-by: Anand Avati 
Signed-off-by: Anand V. Avati 

BUG: 2241 (GlusterFs Stat Actions Degrade During I/O)
URL: http://bugs.gluster.com/cgi-bin/bugzilla3/show_bug.cgi?id=2241

Remove the hard-coded thread-count option in volgen

2010-11-08T04:15:18+00:00

Signed-off-by: Kaushik BV 
Signed-off-by: Anand V. Avati 

BUG: 1159 ()
URL: http://bugs.gluster.com/cgi-bin/bugzilla3/show_bug.cgi?id=1159

Copyright changes

2010-10-11T14:31:12+00:00

Signed-off-by: Vijay Bellur 
Signed-off-by: Vijay Bellur 

BUG: 971 (dynamic volume management)
URL: http://bugs.gluster.com/cgi-bin/bugzilla3/show_bug.cgi?id=971

Change GNU GPL to GNU AGPL

2010-10-04T14:50:05+00:00

Signed-off-by: Pranith Kumar K 
Signed-off-by: Vijay Bellur 

BUG: 1388 ()
URL: http://bugs.gluster.com/cgi-bin/bugzilla3/show_bug.cgi?id=1388

Memory accounting changes

2010-04-23T13:32:52+00:00

Memory accounting Changes. Thanks to Vinayak Hegde and Csaba Henk for their
contributions.

Signed-off-by: Vijay Bellur 
Signed-off-by: Anand V. Avati 

BUG: 329 (Replacing memory allocation functions with mem-type functions)
URL: http://bugs.gluster.com/cgi-bin/bugzilla3/show_bug.cgi?id=329

io-threads: more fixes

2010-02-27T17:34:04+00:00

* conditional for scaling up threads was wrong

* ETIMEDOUT check was performed wrongly

Signed-off-by: Anand V. Avati 
Signed-off-by: Anand V. Avati 

BUG: 583 (filesystem access hangs while deleting large files)
URL: http://bugs.gluster.com/cgi-bin/bugzilla3/show_bug.cgi?id=583

io-threads: single queue/multi-thread model

2010-02-22T16:51:40+00:00

This patch lets io-threads work with a single queue and multiple
threads work on picking the next request from the queue and process
it.

Whenever the number of pending requests in the queue double, a new
worker thread is spawned.

Workers expire after a (configurable) timeout of inactivity

Signed-off-by: Anand V. Avati 
Signed-off-by: Anand V. Avati 
Signed-off-by: Anand V. Avati 

BUG: 583 (filesystem access hangs while deleting large files)
URL: http://bugs.gluster.com/cgi-bin/bugzilla3/show_bug.cgi?id=583

Changed occurrences of Z Research to Gluster.

2009-10-07T10:54:49+00:00

Signed-off-by: Anand V. Avati

io-threads: Fix missed notification in sem_timedwait

2009-06-11T13:29:17+00:00

We're performing a calculation for skewing idle time
that resulted in a timespec.tv_nsec value becoming larger than
1000 million or less than 0, forcing sem_timedwait to return
with an EINVAL instead of waiting for a request notification
from sem_post in iot_notify_worker(). This resulted in a missed
notification that resulted in a hang followed by a timeout
on the protocol/client side.

This commit avoids the over- and under-flow in tv_nsec by
skewing the tv_sec value instead.

Signed-off-by: Anand V. Avati

io-threads: Change mutexes/condvars to spinlocks/semaphores

2009-05-20T18:44:49+00:00

It seems that use of mutexes is resulting in pretty high thread
sleep and wake-up cost. What is worse, if a worker thread has
acquired a  lock, there is a possibility of the main glusterfs thread
being put to sleep. We change the use of mutexes into spinlock.
At the same time, we cannot anymore use condvars for notification since
the condvar interface depends on mutexes itself. Semaphores come to
out rescue. Luckily, even the pthread semaphores have a timedwait
interface to allow our idle worker threads to make an exit decision.

Further, it is possible that spinlocks are not available on all systems
so all this is curtained behind #defines so we can fall back to
mutexes and condvars implementation.

Signed-off-by: Anand V. Avati