]> git.proxmox.com Git - mirror_ubuntu-kernels.git/commit
aio: change reqs_active to include unreaped completions
authorKent Overstreet <koverstreet@google.com>
Tue, 7 May 2013 23:18:51 +0000 (16:18 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Wed, 8 May 2013 01:38:29 +0000 (18:38 -0700)
commit3e845ce01a391d7c5d59ff2f28db5381bf02fa27
tree62213380f984fec969e70b1c1328feab15ec681f
parent0460fef2a9215680f7f85415b57731b7e0fdf673
aio: change reqs_active to include unreaped completions

The aio code tries really hard to avoid having to deal with the
completion ringbuffer overflowing.  To do that, it has to keep track of
the number of outstanding kiocbs, and the number of completions
currently in the ringbuffer - and it's got to check that every time we
allocate a kiocb.  Ouch.

But - we can improve this quite a bit if we just change reqs_active to
mean "number of outstanding requests and unreaped completions" - that
means kiocb allocation doesn't have to look at the ringbuffer, which is
a fairly significant win.

Signed-off-by: Kent Overstreet <koverstreet@google.com>
Cc: Zach Brown <zab@redhat.com>
Cc: Felipe Balbi <balbi@ti.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Mark Fasheh <mfasheh@suse.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Asai Thambi S P <asamymuthupa@micron.com>
Cc: Selvan Mani <smani@micron.com>
Cc: Sam Bradshaw <sbradshaw@micron.com>
Cc: Jeff Moyer <jmoyer@redhat.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Benjamin LaHaise <bcrl@kvack.org>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
fs/aio.c