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writeback: add dirty_throttle_control->dom 

Currently all dirty throttle operations use global_wb_domain; however,
cgroup writeback support requires considering per-memcg wb_domain too.
This patch adds dirty_throttle_control->dom and updates functions
which are directly using globabl_wb_domain to use it instead.

As this makes global_update_bandwidth() a misnomer, the function is
renamed to domain_update_bandwidth().

This patch doesn't introduce any behavioral changes.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Jan Kara <jack@suse.cz>
Cc: Wu Fengguang <fengguang.wu@intel.com>
Cc: Greg Thelen <gthelen@google.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Tejun Heo 2015-05-22 18:23:28 -04:00 committed by Jens Axboe
parent e9770b3487
commit e9f07dfd70
1 changed files with 24 additions and 6 deletions
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30
mm/page-writeback.c
View File

@ -126,6 +126,9 @@ struct wb_domain global_wb_domain;
/* consolidated parameters for balance_dirty_pages() and its subroutines */
struct dirty_throttle_control {
#ifdef CONFIG_CGROUP_WRITEBACK
struct wb_domain *dom;
#endif
struct bdi_writeback *wb;
struct fprop_local_percpu *wb_completions;
@ -140,7 +143,7 @@ struct dirty_throttle_control {
unsigned long pos_ratio;
};
#define GDTC_INIT(__wb) .wb = (__wb), \
#define DTC_INIT_COMMON(__wb) .wb = (__wb), \
.wb_completions = &(__wb)->completions
/*
@ -152,6 +155,14 @@ struct dirty_throttle_control {
#ifdef CONFIG_CGROUP_WRITEBACK
#define GDTC_INIT(__wb) .dom = &global_wb_domain, \
DTC_INIT_COMMON(__wb)
static struct wb_domain *dtc_dom(struct dirty_throttle_control *dtc)
{
return dtc->dom;
}
static void wb_min_max_ratio(struct bdi_writeback *wb,
unsigned long *minp, unsigned long *maxp)
{
@ -181,6 +192,13 @@ static void wb_min_max_ratio(struct bdi_writeback *wb,
#else /* CONFIG_CGROUP_WRITEBACK */
#define GDTC_INIT(__wb) DTC_INIT_COMMON(__wb)
static struct wb_domain *dtc_dom(struct dirty_throttle_control *dtc)
{
return &global_wb_domain;
}
static void wb_min_max_ratio(struct bdi_writeback *wb,
unsigned long *minp, unsigned long *maxp)
{
@ -583,7 +601,7 @@ static unsigned long hard_dirty_limit(unsigned long thresh)
*/
static unsigned long __wb_calc_thresh(struct dirty_throttle_control *dtc)
{
struct wb_domain *dom = &global_wb_domain;
struct wb_domain *dom = dtc_dom(dtc);
unsigned long thresh = dtc->thresh;
u64 wb_thresh;
long numerator, denominator;
@ -952,7 +970,7 @@ static void wb_update_write_bandwidth(struct bdi_writeback *wb,
static void update_dirty_limit(struct dirty_throttle_control *dtc)
{
struct wb_domain *dom = &global_wb_domain;
struct wb_domain *dom = dtc_dom(dtc);
unsigned long thresh = dtc->thresh;
unsigned long limit = dom->dirty_limit;
@ -979,10 +997,10 @@ static void update_dirty_limit(struct dirty_throttle_control *dtc)
dom->dirty_limit = limit;
}
static void global_update_bandwidth(struct dirty_throttle_control *dtc,
static void domain_update_bandwidth(struct dirty_throttle_control *dtc,
unsigned long now)
{
struct wb_domain *dom = &global_wb_domain;
struct wb_domain *dom = dtc_dom(dtc);
/*
* check locklessly first to optimize away locking for the most time
@ -1190,7 +1208,7 @@ static void __wb_update_bandwidth(struct dirty_throttle_control *dtc,
goto snapshot;
if (update_ratelimit) {
global_update_bandwidth(dtc, now);
domain_update_bandwidth(dtc, now);
wb_update_dirty_ratelimit(dtc, dirtied, elapsed);
}
wb_update_write_bandwidth(wb, elapsed, written);