]> err.no Git - linux-2.6/commit
aio: only account I/O wait time in read_events if there are active requests
authorJeff Moyer <jmoyer@redhat.com>
Wed, 5 Dec 2007 07:45:02 +0000 (23:45 -0800)
committerLinus Torvalds <torvalds@woody.linux-foundation.org>
Wed, 5 Dec 2007 17:21:18 +0000 (09:21 -0800)
commite00ba3dae077f54cfd2af42e939a618caa7a3bca
treeeb2f29fe8df7cb29be7d1bdda8dabe825f30f182
parente3c0ac04f980750a368f7cd5f1b8d1d2cdc1f735
aio: only account I/O wait time in read_events if there are active requests

On 2.6.24, top started showing 100% iowait on one CPU when a UML instance was
running (but completely idle).  The UML code sits in io_getevents waiting for
an event to be submitted and completed.

Fix this by checking ctx->reqs_active before scheduling to determine whether
or not we are waiting for I/O.

Signed-off-by: Jeff Moyer <jmoyer@redhat.com>
Cc: Zach Brown <zach.brown@oracle.com>
Cc: Miklos Szeredi <miklos@szeredi.hu>
Cc: Jeff Dike <jdike@addtoit.com>
Cc: "Rafael J. Wysocki" <rjw@sisk.pl>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
fs/aio.c