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| author | Jeff Moyer <jmoyer@redhat.com> | 2007-12-05 10:45:02 +0300 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-12-05 20:21:18 +0300 |
| commit | e00ba3dae077f54cfd2af42e939a618caa7a3bca (patch) | |
| tree | eb2f29fe8df7cb29be7d1bdda8dabe825f30f182 /kernel/fork.c | |
| parent | e3c0ac04f980750a368f7cd5f1b8d1d2cdc1f735 (diff) | |
| download | linux-e00ba3dae077f54cfd2af42e939a618caa7a3bca.tar.xz | |
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>
Diffstat (limited to 'kernel/fork.c')
0 files changed, 0 insertions, 0 deletions