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bdi: add a user-tunable cpu_list for the bdi flusher threads

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In realtime environments, it may be desirable to keep the per-bdi
flusher threads from running on certain cpus.  This patch adds a
cpu_list file to /sys/class/bdi/* to enable this.  The default is to tie
the flusher threads to the same numa node as the backing device (though
I could be convinced to make it a mask of all cpus to avoid a change in
behaviour).

Thanks to Jeremy Eder for the original idea.

Signed-off-by: Jeff Moyer <jmoyer@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jeff Moyer
2012-12-05 20:17:21 +01:00
committed by Jens Axboe
parent c304a51bf4
commit 8fa72d234d
2 changed files with 88 additions and 0 deletions
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4
include/linux/backing-dev.h
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@@ -18,6 +18,7 @@
#include <linux/writeback.h>
#include <linux/atomic.h>
#include <linux/sysctl.h>
#include <linux/mutex.h>
struct page;
struct device;
@@ -105,6 +106,9 @@ struct backing_dev_info {
struct timer_list laptop_mode_wb_timer;
cpumask_t *flusher_cpumask; /* used for writeback thread scheduling */
struct mutex flusher_cpumask_lock;
#ifdef CONFIG_DEBUG_FS
struct dentry *debug_dir;
struct dentry *debug_stats;