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charset="utf-8" This patch let each enabled pmc's memcg register a oom listener, so if oom will trigger, release all hold pages. Signed-off-by: Huan Yang --- include/linux/mmzone.h | 3 +++ mm/memcontrol.c | 31 +++++++++++++++++++++++++++++++ 2 files changed, 34 insertions(+) diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h index b56dd462232b..640a9cf51791 100644 --- a/include/linux/mmzone.h +++ b/include/linux/mmzone.h @@ -622,6 +622,9 @@ struct mem_cgroup_per_node_cache { unsigned int reaper_wait; struct delayed_work reaper_work; =20 + /* listen oom event, release hold cache */ + struct notifier_block oom_nb; + /* max number to hold page, unit page, default 100MB */ #define DEFAULT_PMC_HOLD_LIMIX ((100 << 20) >> PAGE_SHIFT) unsigned int hold_limit; diff --git a/mm/memcontrol.c b/mm/memcontrol.c index ae6917de91cc..3dfb2a17c1fd 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -7101,6 +7101,33 @@ static ssize_t memory_reclaim(struct kernfs_open_fil= e *of, char *buf, return nbytes; } =20 +/** + * This function listen to oom event, if oom will trigger, check and relea= se + * all holded pages. + */ +static int pmc_oom_notify(struct notifier_block *self, + unsigned long notused, void *nfreed) +{ + struct mem_cgroup_per_node_cache *node_cachep =3D + container_of(self, struct mem_cgroup_per_node_cache, oom_nb); + struct mem_cgroup *memcg =3D node_cachep->memcg; + + unsigned long *nf =3D (unsigned long *)nfreed; + + rcu_read_lock(); + if (!css_tryget(&memcg->css)) { + rcu_read_unlock(); + return NOTIFY_STOP; + } + rcu_read_unlock(); + + nf +=3D mem_cgroup_release_cache(node_cachep); + + css_put(&memcg->css); + + return NOTIFY_OK; +} + /** * This function use to reaper all cache pages by cycling scan. * The scan interval time depends on @reaper_wait which can set by `keys` = nest @@ -7176,6 +7203,9 @@ static int __enable_mem_cgroup_cache(struct mem_cgrou= p *memcg) p->allow_watermark =3D DEFAULT_PMC_GAP_WATERMARK; p->reaper_wait =3D DEFAULT_PMC_REAPER_TIME; =20 + p->oom_nb.notifier_call =3D pmc_oom_notify; + register_oom_notifier(&p->oom_nb); + atomic_inc(&pmc_nr_enabled); =20 INIT_DELAYED_WORK(&p->reaper_work, pmc_reaper); @@ -7222,6 +7252,7 @@ static int __disable_mem_cgroup_cache(struct mem_cgro= up *memcg) =20 p =3D nodeinfo->cachep; =20 + unregister_oom_notifier(&p->oom_nb); cancel_delayed_work_sync(&p->reaper_work); mem_cgroup_release_cache(p); =20 --=20 2.45.2