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laptop-mode: Make flushes per-device

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One of the features of laptop-mode is that it forces a writeout of dirty
pages if something else triggers a physical read or write from a device.
The current implementation flushes pages on all devices, rather than only
the one that triggered the flush. This patch alters the behaviour so that
only the recently accessed block device is flushed, preventing other
disks being spun up for no terribly good reason.

Signed-off-by: Matthew Garrett <mjg@redhat.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
Matthew Garrett 2010-04-06 14:25:14 +02:00 • committed by Jens Axboe
parent 9195291e5f
commit 31373d09da
4 changed files with 30 additions and 21 deletions
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3
include/linux/backing-dev.h
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@ -14,6 +14,7 @@
#include <linux/kernel.h>
#include <linux/fs.h>
#include <linux/sched.h>
#include <linux/timer.h>
#include <linux/writeback.h>
#include <asm/atomic.h>
@ -88,6 +89,8 @@ struct backing_dev_info {
struct device *dev;
struct timer_list laptop_mode_wb_timer;
#ifdef CONFIG_DEBUG_FS
struct dentry *debug_dir;
struct dentry *debug_stats;