25 Feb, 2009
1 commit
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Oleg noticed that we don't strictly need CSD_FLAG_WAIT, rework
the code so that we can use CSD_FLAG_LOCK for both purposes.Signed-off-by: Peter Zijlstra
Cc: Oleg Nesterov
Cc: Linus Torvalds
Cc: Nick Piggin
Cc: Jens Axboe
Cc: "Paul E. McKenney"
Cc: Rusty Russell
Signed-off-by: Ingo Molnar
29 Dec, 2008
1 commit
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Sparse asked whether these could be static.
Signed-off-by: Roel Kluin
Signed-off-by: Jens Axboe
09 Oct, 2008
4 commits
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Only works for the generic request timer handling. Allows one to
sporadically ignore request completions, thus exercising the timeout
handling.Signed-off-by: Jens Axboe
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Right now SCSI and others do their own command timeout handling.
Move those bits to the block layer.Instead of having a timer per command, we try to be a bit more clever
and simply have one per-queue. This avoids the overhead of having to
tear down and setup a timer for each command, so it will result in a lot
less timer fiddling.Signed-off-by: Mike Anderson
Signed-off-by: Jens Axboe -
This patch adds support for controlling the IO completion CPU of
either all requests on a queue, or on a per-request basis. We export
a sysfs variable (rq_affinity) which, if set, migrates completions
of requests to the CPU that originally submitted it. A bio helper
(bio_set_completion_cpu()) is also added, so that queuers can ask
for completion on that specific CPU.In testing, this has been show to cut the system time by as much
as 20-40% on synthetic workloads where CPU affinity is desired.This requires a little help from the architecture, so it'll only
work as designed for archs that are using the new generic smp
helper infrastructure.Signed-off-by: Jens Axboe
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Signed-off-by: Jens Axboe
