diff mbox series

[v8,10/13] mm: vmscan: use per memcg nr_deferred of shrinker

Message ID 20210217001322.2226796-11-shy828301@gmail.com (mailing list archive)
State New, archived
Headers show
Series Make shrinker's nr_deferred memcg aware | expand

Commit Message

Yang Shi Feb. 17, 2021, 12:13 a.m. UTC 
Use per memcg's nr_deferred for memcg aware shrinkers.  The shrinker's nr_deferred
will be used in the following cases:
    1. Non memcg aware shrinkers
    2. !CONFIG_MEMCG
    3. memcg is disabled by boot parameter

Signed-off-by: Yang Shi <shy828301@gmail.com>
---
 mm/vmscan.c | 78 ++++++++++++++++++++++++++++++++++++++++++++---------
 1 file changed, 66 insertions(+), 12 deletions(-)

Comments

Roman Gushchin Feb. 17, 2021, 2:10 a.m. UTC | #1 
On Tue, Feb 16, 2021 at 04:13:19PM -0800, Yang Shi wrote:
> Use per memcg's nr_deferred for memcg aware shrinkers.  The shrinker's nr_deferred
> will be used in the following cases:
>     1. Non memcg aware shrinkers
>     2. !CONFIG_MEMCG
>     3. memcg is disabled by boot parameter
> 
> Signed-off-by: Yang Shi <shy828301@gmail.com>

LGTM!

Acked-by: Roman Gushchin <guro@fb.com>

Thanks!
Kirill Tkhai Feb. 17, 2021, 6:39 a.m. UTC | #2 
On 17.02.2021 03:13, Yang Shi wrote:
> Use per memcg's nr_deferred for memcg aware shrinkers.  The shrinker's nr_deferred
> will be used in the following cases:
>     1. Non memcg aware shrinkers
>     2. !CONFIG_MEMCG
>     3. memcg is disabled by boot parameter
> 
> Signed-off-by: Yang Shi <shy828301@gmail.com>

Acked-by: Kirill Tkhai <ktkhai@virtuozzo.com>

> ---
>  mm/vmscan.c | 78 ++++++++++++++++++++++++++++++++++++++++++++---------
>  1 file changed, 66 insertions(+), 12 deletions(-)
> 
> diff --git a/mm/vmscan.c b/mm/vmscan.c
> index fcb399e18fc3..57cbc6bc8a49 100644
> --- a/mm/vmscan.c
> +++ b/mm/vmscan.c
> @@ -374,6 +374,24 @@ static void unregister_memcg_shrinker(struct shrinker *shrinker)
>  	idr_remove(&shrinker_idr, id);
>  }
>  
> +static long xchg_nr_deferred_memcg(int nid, struct shrinker *shrinker,
> +				   struct mem_cgroup *memcg)
> +{
> +	struct shrinker_info *info;
> +
> +	info = shrinker_info_protected(memcg, nid);
> +	return atomic_long_xchg(&info->nr_deferred[shrinker->id], 0);
> +}
> +
> +static long add_nr_deferred_memcg(long nr, int nid, struct shrinker *shrinker,
> +				  struct mem_cgroup *memcg)
> +{
> +	struct shrinker_info *info;
> +
> +	info = shrinker_info_protected(memcg, nid);
> +	return atomic_long_add_return(nr, &info->nr_deferred[shrinker->id]);
> +}
> +
>  static bool cgroup_reclaim(struct scan_control *sc)
>  {
>  	return sc->target_mem_cgroup;
> @@ -412,6 +430,18 @@ static void unregister_memcg_shrinker(struct shrinker *shrinker)
>  {
>  }
>  
> +static long xchg_nr_deferred_memcg(int nid, struct shrinker *shrinker,
> +				   struct mem_cgroup *memcg)
> +{
> +	return 0;
> +}
> +
> +static long add_nr_deferred_memcg(long nr, int nid, struct shrinker *shrinker,
> +				  struct mem_cgroup *memcg)
> +{
> +	return 0;
> +}
> +
>  static bool cgroup_reclaim(struct scan_control *sc)
>  {
>  	return false;
> @@ -423,6 +453,39 @@ static bool writeback_throttling_sane(struct scan_control *sc)
>  }
>  #endif
>  
> +static long xchg_nr_deferred(struct shrinker *shrinker,
> +			     struct shrink_control *sc)
> +{
> +	int nid = sc->nid;
> +
> +	if (!(shrinker->flags & SHRINKER_NUMA_AWARE))
> +		nid = 0;
> +
> +	if (sc->memcg &&
> +	    (shrinker->flags & SHRINKER_MEMCG_AWARE))
> +		return xchg_nr_deferred_memcg(nid, shrinker,
> +					      sc->memcg);
> +
> +	return atomic_long_xchg(&shrinker->nr_deferred[nid], 0);
> +}
> +
> +
> +static long add_nr_deferred(long nr, struct shrinker *shrinker,
> +			    struct shrink_control *sc)
> +{
> +	int nid = sc->nid;
> +
> +	if (!(shrinker->flags & SHRINKER_NUMA_AWARE))
> +		nid = 0;
> +
> +	if (sc->memcg &&
> +	    (shrinker->flags & SHRINKER_MEMCG_AWARE))
> +		return add_nr_deferred_memcg(nr, nid, shrinker,
> +					     sc->memcg);
> +
> +	return atomic_long_add_return(nr, &shrinker->nr_deferred[nid]);
> +}
> +
>  /*
>   * This misses isolated pages which are not accounted for to save counters.
>   * As the data only determines if reclaim or compaction continues, it is
> @@ -558,14 +621,10 @@ static unsigned long do_shrink_slab(struct shrink_control *shrinkctl,
>  	long freeable;
>  	long nr;
>  	long new_nr;
> -	int nid = shrinkctl->nid;
>  	long batch_size = shrinker->batch ? shrinker->batch
>  					  : SHRINK_BATCH;
>  	long scanned = 0, next_deferred;
>  
> -	if (!(shrinker->flags & SHRINKER_NUMA_AWARE))
> -		nid = 0;
> -
>  	freeable = shrinker->count_objects(shrinker, shrinkctl);
>  	if (freeable == 0 || freeable == SHRINK_EMPTY)
>  		return freeable;
> @@ -575,7 +634,7 @@ static unsigned long do_shrink_slab(struct shrink_control *shrinkctl,
>  	 * and zero it so that other concurrent shrinker invocations
>  	 * don't also do this scanning work.
>  	 */
> -	nr = atomic_long_xchg(&shrinker->nr_deferred[nid], 0);
> +	nr = xchg_nr_deferred(shrinker, shrinkctl);
>  
>  	total_scan = nr;
>  	if (shrinker->seeks) {
> @@ -666,14 +725,9 @@ static unsigned long do_shrink_slab(struct shrink_control *shrinkctl,
>  		next_deferred = 0;
>  	/*
>  	 * move the unused scan count back into the shrinker in a
> -	 * manner that handles concurrent updates. If we exhausted the
> -	 * scan, there is no need to do an update.
> +	 * manner that handles concurrent updates.
>  	 */
> -	if (next_deferred > 0)
> -		new_nr = atomic_long_add_return(next_deferred,
> -						&shrinker->nr_deferred[nid]);
> -	else
> -		new_nr = atomic_long_read(&shrinker->nr_deferred[nid]);
> +	new_nr = add_nr_deferred(next_deferred, shrinker, shrinkctl);
>  
>  	trace_mm_shrink_slab_end(shrinker, shrinkctl->nid, freed, nr, new_nr, total_scan);
>  	return freed;
>
Shakeel Butt March 8, 2021, 7:14 p.m. UTC | #3 
On Tue, Feb 16, 2021 at 4:13 PM Yang Shi <shy828301@gmail.com> wrote:
>
> Use per memcg's nr_deferred for memcg aware shrinkers.  The shrinker's nr_deferred
> will be used in the following cases:
>     1. Non memcg aware shrinkers
>     2. !CONFIG_MEMCG
>     3. memcg is disabled by boot parameter
>
> Signed-off-by: Yang Shi <shy828301@gmail.com>

Reviewed-by: Shakeel Butt <shakeelb@google.com>
diff mbox series

Patch

diff --git a/mm/vmscan.c b/mm/vmscan.c
index fcb399e18fc3..57cbc6bc8a49 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -374,6 +374,24 @@  static void unregister_memcg_shrinker(struct shrinker *shrinker)
 	idr_remove(&shrinker_idr, id);
 }
 
+static long xchg_nr_deferred_memcg(int nid, struct shrinker *shrinker,
+				   struct mem_cgroup *memcg)
+{
+	struct shrinker_info *info;
+
+	info = shrinker_info_protected(memcg, nid);
+	return atomic_long_xchg(&info->nr_deferred[shrinker->id], 0);
+}
+
+static long add_nr_deferred_memcg(long nr, int nid, struct shrinker *shrinker,
+				  struct mem_cgroup *memcg)
+{
+	struct shrinker_info *info;
+
+	info = shrinker_info_protected(memcg, nid);
+	return atomic_long_add_return(nr, &info->nr_deferred[shrinker->id]);
+}
+
 static bool cgroup_reclaim(struct scan_control *sc)
 {
 	return sc->target_mem_cgroup;
@@ -412,6 +430,18 @@  static void unregister_memcg_shrinker(struct shrinker *shrinker)
 {
 }
 
+static long xchg_nr_deferred_memcg(int nid, struct shrinker *shrinker,
+				   struct mem_cgroup *memcg)
+{
+	return 0;
+}
+
+static long add_nr_deferred_memcg(long nr, int nid, struct shrinker *shrinker,
+				  struct mem_cgroup *memcg)
+{
+	return 0;
+}
+
 static bool cgroup_reclaim(struct scan_control *sc)
 {
 	return false;
@@ -423,6 +453,39 @@  static bool writeback_throttling_sane(struct scan_control *sc)
 }
 #endif
 
+static long xchg_nr_deferred(struct shrinker *shrinker,
+			     struct shrink_control *sc)
+{
+	int nid = sc->nid;
+
+	if (!(shrinker->flags & SHRINKER_NUMA_AWARE))
+		nid = 0;
+
+	if (sc->memcg &&
+	    (shrinker->flags & SHRINKER_MEMCG_AWARE))
+		return xchg_nr_deferred_memcg(nid, shrinker,
+					      sc->memcg);
+
+	return atomic_long_xchg(&shrinker->nr_deferred[nid], 0);
+}
+
+
+static long add_nr_deferred(long nr, struct shrinker *shrinker,
+			    struct shrink_control *sc)
+{
+	int nid = sc->nid;
+
+	if (!(shrinker->flags & SHRINKER_NUMA_AWARE))
+		nid = 0;
+
+	if (sc->memcg &&
+	    (shrinker->flags & SHRINKER_MEMCG_AWARE))
+		return add_nr_deferred_memcg(nr, nid, shrinker,
+					     sc->memcg);
+
+	return atomic_long_add_return(nr, &shrinker->nr_deferred[nid]);
+}
+
 /*
  * This misses isolated pages which are not accounted for to save counters.
  * As the data only determines if reclaim or compaction continues, it is
@@ -558,14 +621,10 @@  static unsigned long do_shrink_slab(struct shrink_control *shrinkctl,
 	long freeable;
 	long nr;
 	long new_nr;
-	int nid = shrinkctl->nid;
 	long batch_size = shrinker->batch ? shrinker->batch
 					  : SHRINK_BATCH;
 	long scanned = 0, next_deferred;
 
-	if (!(shrinker->flags & SHRINKER_NUMA_AWARE))
-		nid = 0;
-
 	freeable = shrinker->count_objects(shrinker, shrinkctl);
 	if (freeable == 0 || freeable == SHRINK_EMPTY)
 		return freeable;
@@ -575,7 +634,7 @@  static unsigned long do_shrink_slab(struct shrink_control *shrinkctl,
 	 * and zero it so that other concurrent shrinker invocations
 	 * don't also do this scanning work.
 	 */
-	nr = atomic_long_xchg(&shrinker->nr_deferred[nid], 0);
+	nr = xchg_nr_deferred(shrinker, shrinkctl);
 
 	total_scan = nr;
 	if (shrinker->seeks) {
@@ -666,14 +725,9 @@  static unsigned long do_shrink_slab(struct shrink_control *shrinkctl,
 		next_deferred = 0;
 	/*
 	 * move the unused scan count back into the shrinker in a
-	 * manner that handles concurrent updates. If we exhausted the
-	 * scan, there is no need to do an update.
+	 * manner that handles concurrent updates.
 	 */
-	if (next_deferred > 0)
-		new_nr = atomic_long_add_return(next_deferred,
-						&shrinker->nr_deferred[nid]);
-	else
-		new_nr = atomic_long_read(&shrinker->nr_deferred[nid]);
+	new_nr = add_nr_deferred(next_deferred, shrinker, shrinkctl);
 
 	trace_mm_shrink_slab_end(shrinker, shrinkctl->nid, freed, nr, new_nr, total_scan);
 	return freed;