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[PATCH] per-task-delay-accounting: sync block I/O and swapin delay collection

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Unlike earlier iterations of the delay accounting patches, now delays are only
collected for the actual I/O waits rather than try and cover the delays seen
in I/O submission paths.

Account separately for block I/O delays incurred as a result of swapin page
faults whose frequency can be affected by the task/process' rss limit.  Hence
swapin delays can act as feedback for rss limit changes independent of I/O
priority changes.

Signed-off-by: Shailabh Nagar <nagar@watson.ibm.com>
Signed-off-by: Balbir Singh <balbir@in.ibm.com>
Cc: Jes Sorensen <jes@sgi.com>
Cc: Peter Chubb <peterc@gelato.unsw.edu.au>
Cc: Erich Focht <efocht@ess.nec.de>
Cc: Levent Serinol <lserinol@gmail.com>
Cc: Jay Lan <jlan@engr.sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Shailabh Nagar 2006-07-14 00:24:37 -07:00 • committed by Linus Torvalds
parent ca74e92b46
commit 0ff922452d
5 changed files with 66 additions and 0 deletions
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25
include/linux/delayacct.h
View file

@ -19,6 +19,13 @@
#include <linux/sched.h>
/*
* Per-task flags relevant to delay accounting
* maintained privately to avoid exhausting similar flags in sched.h:PF_*
* Used to set current->delays->flags
*/
#define DELAYACCT_PF_SWAPIN 0x00000001 /* I am doing a swapin */
#ifdef CONFIG_TASK_DELAY_ACCT
extern int delayacct_on; /* Delay accounting turned on/off */
@ -26,6 +33,8 @@ extern kmem_cache_t *delayacct_cache;
extern void delayacct_init(void);
extern void __delayacct_tsk_init(struct task_struct *);
extern void __delayacct_tsk_exit(struct task_struct *);
extern void __delayacct_blkio_start(void);
extern void __delayacct_blkio_end(void);
static inline void delayacct_set_flag(int flag)
{
@ -53,6 +62,18 @@ static inline void delayacct_tsk_exit(struct task_struct *tsk)
__delayacct_tsk_exit(tsk);
}
static inline void delayacct_blkio_start(void)
{
if (current->delays)
__delayacct_blkio_start();
}
static inline void delayacct_blkio_end(void)
{
if (current->delays)
__delayacct_blkio_end();
}
#else
static inline void delayacct_set_flag(int flag)
{}
@ -64,6 +85,10 @@ static inline void delayacct_tsk_init(struct task_struct *tsk)
{}
static inline void delayacct_tsk_exit(struct task_struct *tsk)
{}
static inline void delayacct_blkio_start(void)
{}
static inline void delayacct_blkio_end(void)
{}
#endif /* CONFIG_TASK_DELAY_ACCT */
#endif