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Message-ID: <CAFk61EGgQ7hjRiL+QPnZena-AzEgP+azQTo44S=WiJqxmX9OYw@mail.gmail.com>
Date: Sat, 16 Apr 2022 22:34:35 +0900
From: dthex5d <dthex5d@...il.com>
To: Andrew Morton <akpm@...ux-foundation.org>,
Mike Kravetz <mike.kravetz@...cle.com>,
Christoph Lameter <cl@...ux.com>,
Pekka Enberg <penberg@...nel.org>,
David Rientjes <rientjes@...gle.com>,
Joonsoo Kim <iamjoonsoo.kim@....com>,
Vlastimil Babka <vbabka@...e.cz>,
Roman Gushchin <roman.gushchin@...ux.dev>
Cc: Ohhoon Kwon <ohkwon1043@...il.com>,
JaeSang Yoo <jsyoo5b@...il.com>,
Wonhyuk Yang <vvghjk1234@...il.com>,
Jiyoup Kim <lakroforce@...il.com>, linux-mm@...ck.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm/mmzone: Introduce a new macro for_each_node_zonelist()
There was a compiler error that I missed.
Sorry for bothering you guys.
I just sent a v2 for this patch.
On Sat, Apr 16, 2022 at 9:39 PM Donghyeok Kim <dthex5d@...il.com> wrote:
>
> There are some codes using for_each_zone_zonelist() even when only
> iterating each node is needed. This commit introduces a new macro
> for_each_node_zonelist() which iterates through valid nodes in the
> zonelist.
>
> By using this new macro, code can be written in a much simpler form.
> Also, slab/slub can now skip trying to allocate from the node which was
> previously tried and failed.
>
> Co-developed-by: Ohhoon Kwon <ohkwon1043@...il.com>
> Signed-off-by: Ohhoon Kwon <ohkwon1043@...il.com>
> Signed-off-by: Donghyeok Kim <dthex5d@...il.com>
> ---
> include/linux/mmzone.h | 36 ++++++++++++++++++++++++++++++++++++
> mm/hugetlb.c | 17 +++++++----------
> mm/mmzone.c | 17 +++++++++++++++++
> mm/slab.c | 7 ++-----
> mm/slub.c | 8 ++++----
> mm/vmscan.c | 15 ++++++---------
> 6 files changed, 72 insertions(+), 28 deletions(-)
>
> diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
> index 9aaa04ac862f..cb2ddd0b4c95 100644
> --- a/include/linux/mmzone.h
> +++ b/include/linux/mmzone.h
> @@ -1464,6 +1464,42 @@ static inline struct zoneref *first_zones_zonelist(struct zonelist *zonelist,
> #define for_each_zone_zonelist(zone, z, zlist, highidx) \
> for_each_zone_zonelist_nodemask(zone, z, zlist, highidx, NULL)
>
> +
> +struct zoneref *next_node_zones_zonelist(struct zoneref *z,
> + int prev_nid,
> + enum zone_type highest_zoneidx,
> + nodemask_t *nodes);
> +
> +/**
> + * for_each_node_zonelist_nodemask - helper macro to iterate over valid nodes in a zonelist which have at least one zone at or below a given zone index and within a nodemask
> + * @node: The current node in the iterator
> + * @z: First matched zoneref within current node
> + * @zlist: The zonelist being iterated
> + * @highidx: The zone index of the highest zone in the node
> + * @nodemask: Nodemask allowed by the allocator
> + *
> + * This iterator iterates through all nodes which have at least one zone at or below a given zone index and
> + * within a given nodemask
> + */
> +#define for_each_node_zonelist_nodemask(node, z, zlist, highidx, nodemask) \
> + for (z = first_zones_zonelist(zlist, highidx, nodemask), \
> + node = zonelist_zone(z) ? zonelist_node_idx(z) : NUMA_NO_NODE; \
> + zonelist_zone(z); \
> + z = next_node_zones_zonelist(++z, node, highidx, nodemask), \
> + node = zonelist_zone(z) ? zonelist_node_idx(z) : NUMA_NO_NODE)
> +
> +/**
> + * for_each_node_zonelist - helper macro to iterate over nodes in a zonelist which have at least one zone at or below a given zone index
> + * @node: The current node in the iterator
> + * @z: First matched zoneref within current node
> + * @zlist: The zonelist being iterated
> + * @highidx: The zone index of the highest zone in the node
> + *
> + * This iterator iterates through all nodes which have at least one zone at or below a given zone index.
> + */
> +#define for_each_node_zonelist(node, z, zlist, highidx) \
> + for_each_node_zonelist_nodemask(node, z, zlist, highidx, NULL)
> +
> /* Whether the 'nodes' are all movable nodes */
> static inline bool movable_only_nodes(nodemask_t *nodes)
> {
> diff --git a/mm/hugetlb.c b/mm/hugetlb.c
> index daa4bdd6c26c..283f28f1aca8 100644
> --- a/mm/hugetlb.c
> +++ b/mm/hugetlb.c
> @@ -1157,7 +1157,6 @@ static struct page *dequeue_huge_page_nodemask(struct hstate *h, gfp_t gfp_mask,
> {
> unsigned int cpuset_mems_cookie;
> struct zonelist *zonelist;
> - struct zone *zone;
> struct zoneref *z;
> int node = NUMA_NO_NODE;
>
> @@ -1165,18 +1164,16 @@ static struct page *dequeue_huge_page_nodemask(struct hstate *h, gfp_t gfp_mask,
>
> retry_cpuset:
> cpuset_mems_cookie = read_mems_allowed_begin();
> - for_each_zone_zonelist_nodemask(zone, z, zonelist, gfp_zone(gfp_mask), nmask) {
> +
> + /*
> + * no need to ask again on the same node. Pool is node rather than
> + * zone aware
> + */
> + for_each_node_zonelist_nodemask(node, z, zonelist, gfp_zone(gfp_mask), nmask) {
> struct page *page;
>
> - if (!cpuset_zone_allowed(zone, gfp_mask))
> - continue;
> - /*
> - * no need to ask again on the same node. Pool is node rather than
> - * zone aware
> - */
> - if (zone_to_nid(zone) == node)
> + if (!cpuset_node_allowed(node, gfp_mask))
> continue;
> - node = zone_to_nid(zone);
>
> page = dequeue_huge_page_node_exact(h, node);
> if (page)
> diff --git a/mm/mmzone.c b/mm/mmzone.c
> index 68e1511be12d..8b7d6286056e 100644
> --- a/mm/mmzone.c
> +++ b/mm/mmzone.c
> @@ -72,6 +72,23 @@ struct zoneref *__next_zones_zonelist(struct zoneref *z,
> return z;
> }
>
> +/* Returns the zone in the next node and at or below highest_zoneidx in a zonelist */
> +struct zoneref *next_node_zones_zonelist(struct zoneref *z,
> + int prev_nid,
> + enum zone_type highest_zoneidx,
> + nodemask_t *nodes)
> +{
> + if (likely(nodes == NULL))
> + while (z->zone && (zonelist_node_idx(z) == prev_nid || zonelist_zone_idx(z) > highest_zoneidx))
> + z++;
> + else
> + while (z->zone && (zonelist_node_idx(z) == prev_nid || zonelist_zone_idx(z) > highest_zoneidx ||
> + !zref_in_nodemask(z, nodes)))
> + z++;
> +
> + return z;
> +}
> +
> void lruvec_init(struct lruvec *lruvec)
> {
> enum lru_list lru;
> diff --git a/mm/slab.c b/mm/slab.c
> index a301f266efd1..b374fb88f80e 100644
> --- a/mm/slab.c
> +++ b/mm/slab.c
> @@ -3077,7 +3077,6 @@ static void *fallback_alloc(struct kmem_cache *cache, gfp_t flags)
> {
> struct zonelist *zonelist;
> struct zoneref *z;
> - struct zone *zone;
> enum zone_type highest_zoneidx = gfp_zone(flags);
> void *obj = NULL;
> struct slab *slab;
> @@ -3096,10 +3095,8 @@ static void *fallback_alloc(struct kmem_cache *cache, gfp_t flags)
> * Look through allowed nodes for objects available
> * from existing per node queues.
> */
> - for_each_zone_zonelist(zone, z, zonelist, highest_zoneidx) {
> - nid = zone_to_nid(zone);
> -
> - if (cpuset_zone_allowed(zone, flags) &&
> + for_each_node_zonelist(nid, z, zonelist, highest_zoneidx) {
> + if (cpuset_node_allowed(nid, flags) &&
> get_node(cache, nid) &&
> get_node(cache, nid)->free_objects) {
> obj = ____cache_alloc_node(cache,
> diff --git a/mm/slub.c b/mm/slub.c
> index 6dc703488d30..3e8b4aa98b84 100644
> --- a/mm/slub.c
> +++ b/mm/slub.c
> @@ -2192,7 +2192,7 @@ static void *get_any_partial(struct kmem_cache *s, gfp_t flags,
> #ifdef CONFIG_NUMA
> struct zonelist *zonelist;
> struct zoneref *z;
> - struct zone *zone;
> + int nid;
> enum zone_type highest_zoneidx = gfp_zone(flags);
> void *object;
> unsigned int cpuset_mems_cookie;
> @@ -2222,12 +2222,12 @@ static void *get_any_partial(struct kmem_cache *s, gfp_t flags,
> do {
> cpuset_mems_cookie = read_mems_allowed_begin();
> zonelist = node_zonelist(mempolicy_slab_node(), flags);
> - for_each_zone_zonelist(zone, z, zonelist, highest_zoneidx) {
> + for_each_node_zonelist(nid, z, zonelist, highest_zoneidx) {
> struct kmem_cache_node *n;
>
> - n = get_node(s, zone_to_nid(zone));
> + n = get_node(s, nid);
>
> - if (n && cpuset_zone_allowed(zone, flags) &&
> + if (n && cpuset_node_allowed(nid, flags) &&
> n->nr_partial > s->min_partial) {
> object = get_partial_node(s, n, ret_slab, flags);
> if (object) {
> diff --git a/mm/vmscan.c b/mm/vmscan.c
> index d4a7d2bd276d..f25b71bf8f61 100644
> --- a/mm/vmscan.c
> +++ b/mm/vmscan.c
> @@ -6176,9 +6176,9 @@ static unsigned long do_try_to_free_pages(struct zonelist *zonelist,
> struct scan_control *sc)
> {
> int initial_priority = sc->priority;
> - pg_data_t *last_pgdat;
> + pg_data_t *pgdat;
> struct zoneref *z;
> - struct zone *zone;
> + int nid;
> retry:
> delayacct_freepages_start();
>
> @@ -6206,19 +6206,16 @@ static unsigned long do_try_to_free_pages(struct zonelist *zonelist,
> } while (--sc->priority >= 0);
>
> last_pgdat = NULL;
> - for_each_zone_zonelist_nodemask(zone, z, zonelist, sc->reclaim_idx,
> + for_each_node_zonelist_nodemask(nid, z, zonelist, sc->reclaim_idx,
> sc->nodemask) {
> - if (zone->zone_pgdat == last_pgdat)
> - continue;
> - last_pgdat = zone->zone_pgdat;
> + pgdat = NODE_DATA(nid);
>
> - snapshot_refaults(sc->target_mem_cgroup, zone->zone_pgdat);
> + snapshot_refaults(sc->target_mem_cgroup, pgdat);
>
> if (cgroup_reclaim(sc)) {
> struct lruvec *lruvec;
>
> - lruvec = mem_cgroup_lruvec(sc->target_mem_cgroup,
> - zone->zone_pgdat);
> + lruvec = mem_cgroup_lruvec(sc->target_mem_cgroup, pgdat);
> clear_bit(LRUVEC_CONGESTED, &lruvec->flags);
> }
> }
> --
> 2.17.1
>
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