linux-toradex.git/drivers/md/bcache/util.c, branch v3.10.71 Linux kernel for Apalis and Colibri modules bcache: Fix a writeback performance regression 2013-10-05T14:13:09+00:00 Kent Overstreet kmo@daterainc.com 2013-09-24T06:17:31+00:00 48c4100e10b75152098675d534d8a6109b28f1bf commit c2a4f3183a1248f615a695fbd8905da55ad11bba upstream. Background writeback works by scanning the btree for dirty data and adding those keys into a fixed size buffer, then for each dirty key in the keybuf writing it to the backing device. When read_dirty() finishes and it's time to scan for more dirty data, we need to wait for the outstanding writeback IO to finish - they still take up slots in the keybuf (so that foreground writes can check for them to avoid races) - without that wait, we'll continually rescan when we'll be able to add at most a key or two to the keybuf, and that takes locks that starves foreground IO. Doh. Signed-off-by: Kent Overstreet <kmo@daterainc.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 
commit c2a4f3183a1248f615a695fbd8905da55ad11bba upstream.

Background writeback works by scanning the btree for dirty data and
adding those keys into a fixed size buffer, then for each dirty key in
the keybuf writing it to the backing device.

When read_dirty() finishes and it's time to scan for more dirty data, we
need to wait for the outstanding writeback IO to finish - they still
take up slots in the keybuf (so that foreground writes can check for
them to avoid races) - without that wait, we'll continually rescan when
we'll be able to add at most a key or two to the keybuf, and that takes
locks that starves foreground IO.  Doh.

Signed-off-by: Kent Overstreet <kmo@daterainc.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
bcache: Fix a format string overflow 2013-04-08T20:33:49+00:00 Kent Overstreet koverstreet@google.com 2013-04-05T21:12:28+00:00 91bbcfc36142354e316e013449051619c1c7b456 Reported-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Kent Overstreet <koverstreet@google.com> 
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Kent Overstreet <koverstreet@google.com>
bcache: Sparse fixes 2013-04-08T20:33:48+00:00 Kent Overstreet koverstreet@google.com 2013-03-26T20:49:02+00:00 c19ed23a0b1848eca6b6f22c1ee233abe54d37f9 Signed-off-by: Kent Overstreet <koverstreet@google.com> 
Signed-off-by: Kent Overstreet <koverstreet@google.com>
bcache: Don't export utility code, prefix with bch_ 2013-03-28T18:50:55+00:00 Kent Overstreet koverstreet@google.com 2013-03-28T18:50:55+00:00 169ef1cf6171d35550fef85645b83b960e241cff Signed-off-by: Kent Overstreet <koverstreet@google.com> Cc: linux-bcache@vger.kernel.org Signed-off-by: Jens Axboe <axboe@kernel.dk> 
Signed-off-by: Kent Overstreet <koverstreet@google.com>
Cc: linux-bcache@vger.kernel.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>
bcache: A block layer cache 2013-03-23T23:11:31+00:00 Kent Overstreet koverstreet@google.com 2013-03-23T23:11:31+00:00 cafe563591446cf80bfbc2fe3bc72a2e36cf1060 Does writethrough and writeback caching, handles unclean shutdown, and has a bunch of other nifty features motivated by real world usage. See the wiki at http://bcache.evilpiepirate.org for more. Signed-off-by: Kent Overstreet <koverstreet@google.com> 
Does writethrough and writeback caching, handles unclean shutdown, and
has a bunch of other nifty features motivated by real world usage.

See the wiki at http://bcache.evilpiepirate.org for more.

Signed-off-by: Kent Overstreet <koverstreet@google.com>