提交 df56e1cf 编写于 作者: J Josef Bacik 提交者: Joseph Qi

blk-cgroup: turn on psi memstall stuff

commit fd112c74652371a023f85d87b70bee7169e8f4d0 upstream.

With the psi stuff in place we can use the memstall flag to indicate
pressure that happens from throttling.
Signed-off-by: NJosef Bacik <jbacik@fb.com>
Signed-off-by: NTejun Heo <tj@kernel.org>
Signed-off-by: NJens Axboe <axboe@kernel.dk>
Signed-off-by: NJoseph Qi <joseph.qi@linux.alibaba.com>
Acked-by: NCaspar Zhang <caspar@linux.alibaba.com>
上级 149e0aae
......@@ -28,6 +28,7 @@
#include <linux/ctype.h>
#include <linux/blk-cgroup.h>
#include <linux/tracehook.h>
#include <linux/psi.h>
#include "blk.h"
#define MAX_KEY_LEN 100
......@@ -1677,6 +1678,7 @@ static void blkcg_scale_delay(struct blkcg_gq *blkg, u64 now)
*/
static void blkcg_maybe_throttle_blkg(struct blkcg_gq *blkg, bool use_memdelay)
{
unsigned long pflags;
u64 now = ktime_to_ns(ktime_get());
u64 exp;
u64 delay_nsec = 0;
......@@ -1703,11 +1705,8 @@ static void blkcg_maybe_throttle_blkg(struct blkcg_gq *blkg, bool use_memdelay)
*/
delay_nsec = min_t(u64, delay_nsec, 250 * NSEC_PER_MSEC);
/*
* TODO: the use_memdelay flag is going to be for the upcoming psi stuff
* that hasn't landed upstream yet. Once that stuff is in place we need
* to do a psi_memstall_enter/leave if memdelay is set.
*/
if (use_memdelay)
psi_memstall_enter(&pflags);
exp = ktime_add_ns(now, delay_nsec);
tok = io_schedule_prepare();
......@@ -1717,6 +1716,9 @@ static void blkcg_maybe_throttle_blkg(struct blkcg_gq *blkg, bool use_memdelay)
break;
} while (!fatal_signal_pending(current));
io_schedule_finish(tok);
if (use_memdelay)
psi_memstall_leave(&pflags);
}
/**
......
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