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misc_cgroup: introduce misc.events to count failures

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Introduce misc.events to make it easier for us to understand
the pressure of resources. Currently only the 'max' event is
implemented, which indicates the times the resource is about
to exceeds the max limit.

Signed-off-by: Chunguang Xu <brookxu@tencent.com>
Reviewed-by: Vipin Sharma <vipinsh@google.com>
Reviewed-by: Michal Koutný <mkoutny@suse.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Chunguang Xu 2021-09-17 20:44:14 +08:00 committed by Tejun Heo
parent c0002d11d7
commit f279294b32
2 changed files with 29 additions and 0 deletions
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5
include/linux/misc_cgroup.h
View file

@ -36,6 +36,7 @@ struct misc_cg;
struct misc_res {
unsigned long max;
atomic_long_t usage;
atomic_long_t events;
bool failed;
};
@ -46,6 +47,10 @@ struct misc_res {
*/
struct misc_cg {
struct cgroup_subsys_state css;
/* misc.events */
struct cgroup_file events_file;
struct misc_res res[MISC_CG_RES_TYPES];
};

24
kernel/cgroup/misc.c
View file

@ -171,6 +171,11 @@ int misc_cg_try_charge(enum misc_res_type type, struct misc_cg *cg,
return 0;
err_charge:
for (j = i; j; j = parent_misc(j)) {
atomic_long_inc(&j->res[type].events);
cgroup_file_notify(&j->events_file);
}
for (j = cg; j != i; j = parent_misc(j))
misc_cg_cancel_charge(type, j, amount);
misc_cg_cancel_charge(type, i, amount);
@ -335,6 +340,19 @@ static int misc_cg_capacity_show(struct seq_file *sf, void *v)
return 0;
}
static int misc_events_show(struct seq_file *sf, void *v)
{
struct misc_cg *cg = css_misc(seq_css(sf));
unsigned long events, i;
for (i = 0; i < MISC_CG_RES_TYPES; i++) {
events = atomic_long_read(&cg->res[i].events);
if (READ_ONCE(misc_res_capacity[i]) || events)
seq_printf(sf, "%s.max %lu\n", misc_res_name[i], events);
}
return 0;
}
/* Misc cgroup interface files */
static struct cftype misc_cg_files[] = {
{
@ -353,6 +371,12 @@ static struct cftype misc_cg_files[] = {
.seq_show = misc_cg_capacity_show,
.flags = CFTYPE_ONLY_ON_ROOT,
},
{
.name = "events",
.flags = CFTYPE_NOT_ON_ROOT,
.file_offset = offsetof(struct misc_cg, events_file),
.seq_show = misc_events_show,
},
{}
};