glusterfs.git/xlators/performance/quick-read/src/quick-read.h, branch v3.0.5rc6

performance/quick-read: implement an upper size limit for the cache.

2010-05-26T07:13:48+00:00

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

BUG: 723 (enhancements to quick read)
URL: http://bugs.gluster.com/cgi-bin/bugzilla3/show_bug.cgi?id=723

performance/quick-read: don't try to validate again if qr_readv is called just after validation.

2010-04-27T09:38:23+00:00

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

BUG: 852 (QR cache-timeout 0 causes high CPU usage and app hangs)
URL: http://bugs.gluster.com/cgi-bin/bugzilla3/show_bug.cgi?id=852

performance/quick-read: read directly from backend for fds opened with O_DIRECT flag.

2010-04-08T10:08:54+00:00

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

BUG: 723 (enhancements to quick read)
URL: http://bugs.gluster.com/cgi-bin/bugzilla3/show_bug.cgi?id=723

Changed occurrences of Z Research to Gluster.

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

Signed-off-by: Anand V. Avati

performance/quick-read: if open fails during cache validation, don't continue validation process.

2009-09-08T10:22:39+00:00

Signed-off-by: Anand V. Avati 

BUG: 232 (Quick-read: if open fails during cache validation, don't continue validation process.)
URL: http://bugs.gluster.com/cgi-bin/bugzilla3/show_bug.cgi?id=232

quick-read: implement qr_open

2009-07-16T07:37:44+00:00

- The file is opened actually only if it is not cached already in lookup.
    This adds responsibility for fops operating on fds to make sure that a
    valid fd actually opened on a file is used to complete the fop.

Signed-off-by: Anand V. Avati

quick-read: add qr_lookup.

2009-07-16T07:37:44+00:00

Signed-off-by: Anand V. Avati

Implementing quick-read translator.

2009-07-16T07:37:44+00:00

lookup can fetch the entire file in xattr dictionary using the key
"glusterfs.content". We set the maximum size of the file that can
be fetched so in the xattr_req dictionary using the same key. If file-size
is less than or equal to the value set in dictionary, the content is stored
in the dictionary using same key in lookup_cbk.

For small files, we can do an optimization wherein we do not really send the
calls open, read and close to the storage translators. Instead there can be
an xlator which fakes open, read and close calls. For reads, it sends the data
it has cached during lookup and hence saving the time for open, read and close
calls to reach storage translators (this time can be significant if calls have
to go through network to reach storage translator).

Signed-off-by: Anand V. Avati