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author | Kent Overstreet <koverstreet@google.com> | 2013-04-26 02:58:39 +0200 |
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committer | Benjamin LaHaise <bcrl@kvack.org> | 2013-07-30 17:53:11 +0200 |
commit | e1bdd5f27a5b14e24a658d5511bebceb67679d83 (patch) | |
tree | 3c18d12918a5ebe02bc38f63dd29031ea40673e0 /fs/devpts | |
parent | aio: reqs_active -> reqs_available (diff) | |
download | linux-e1bdd5f27a5b14e24a658d5511bebceb67679d83.tar.xz linux-e1bdd5f27a5b14e24a658d5511bebceb67679d83.zip |
aio: percpu reqs_available
See the previous patch ("aio: reqs_active -> reqs_available") for why we
want to do this - this basically implements a per cpu allocator for
reqs_available that doesn't actually allocate anything.
Note that we need to increase the size of the ringbuffer we allocate,
since a single thread won't necessarily be able to use all the
reqs_available slots - some (up to about half) might be on other per cpu
lists, unavailable for the current thread.
We size the ringbuffer based on the nr_events userspace passed to
io_setup(), so this is a slight behaviour change - but nr_events wasn't
being used as a hard limit before, it was being rounded up to the next
page before so this doesn't change the actual semantics.
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>
Reviewed-by: "Theodore Ts'o" <tytso@mit.edu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Benjamin LaHaise <bcrl@kvack.org>
Diffstat (limited to 'fs/devpts')
0 files changed, 0 insertions, 0 deletions