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Date: Mon, 5 May 2014 17:31:44 +0200
From: Michal Hocko <mhocko@...e.cz>
To: Johannes Weiner <hannes@...xchg.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
Jianyu Zhan <nasa4836@...il.com>, bsingharora@...il.com,
kamezawa.hiroyu@...fujitsu.com, cgroups@...r.kernel.org,
linux-mm@...ck.org, linux-kernel@...r.kernel.org,
akpm@...ux-foundation.com
Subject: Re: [PATCH 2/2] mm/memcontrol.c: introduce helper
mem_cgroup_zoneinfo_zone()
On Fri 02-05-14 19:29:08, Johannes Weiner wrote:
[...]
> From: Jianyu Zhan <nasa4836@...il.com>
> Subject: [patch] mm: memcontrol: clean up memcg zoneinfo lookup
>
> Memcg zoneinfo lookup sites have either the page, the zone, or the
> node id and zone index, but sites that only have the zone have to look
> up the node id and zone index themselves, whereas sites that already
> have those two integers use a function for a simple pointer chase.
>
> Provide mem_cgroup_zone_zoneinfo() that takes a zone pointer and let
> sites that already have node id and zone index - all for each node,
> for each zone iterators - use &memcg->nodeinfo[nid]->zoneinfo[zid].
>
> Rename page_cgroup_zoneinfo() to mem_cgroup_page_zoneinfo() to match.
>
> Signed-off-by: Jianyu Zhan <nasa4836@...il.com>
> Signed-off-by: Johannes Weiner <hannes@...xchg.org>
OK, this looks better. The naming is more descriptive and it even
removes some code. Good. The opencoded zoneinfo dereference is not that
nice but I guess I can live with it.
Acked-by: Michal Hocko <mhocko@...e.cz>
> ---
> mm/memcontrol.c | 89 +++++++++++++++++++++++++--------------------------------
> 1 file changed, 39 insertions(+), 50 deletions(-)
>
> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index 29501f040568..83cbd5a0e62f 100644
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -677,9 +677,11 @@ static void disarm_static_keys(struct mem_cgroup *memcg)
> static void drain_all_stock_async(struct mem_cgroup *memcg);
>
> static struct mem_cgroup_per_zone *
> -mem_cgroup_zoneinfo(struct mem_cgroup *memcg, int nid, int zid)
> +mem_cgroup_zone_zoneinfo(struct mem_cgroup *memcg, struct zone *zone)
> {
> - VM_BUG_ON((unsigned)nid >= nr_node_ids);
> + int nid = zone_to_nid(zone);
> + int zid = zone_idx(zone);
> +
> return &memcg->nodeinfo[nid]->zoneinfo[zid];
> }
>
> @@ -689,12 +691,12 @@ struct cgroup_subsys_state *mem_cgroup_css(struct mem_cgroup *memcg)
> }
>
> static struct mem_cgroup_per_zone *
> -page_cgroup_zoneinfo(struct mem_cgroup *memcg, struct page *page)
> +mem_cgroup_page_zoneinfo(struct mem_cgroup *memcg, struct page *page)
> {
> int nid = page_to_nid(page);
> int zid = page_zonenum(page);
>
> - return mem_cgroup_zoneinfo(memcg, nid, zid);
> + return &memcg->nodeinfo[nid]->zoneinfo[zid];
> }
>
> static struct mem_cgroup_tree_per_zone *
> @@ -773,16 +775,14 @@ static void mem_cgroup_update_tree(struct mem_cgroup *memcg, struct page *page)
> unsigned long long excess;
> struct mem_cgroup_per_zone *mz;
> struct mem_cgroup_tree_per_zone *mctz;
> - int nid = page_to_nid(page);
> - int zid = page_zonenum(page);
> - mctz = soft_limit_tree_from_page(page);
>
> + mctz = soft_limit_tree_from_page(page);
> /*
> * Necessary to update all ancestors when hierarchy is used.
> * because their event counter is not touched.
> */
> for (; memcg; memcg = parent_mem_cgroup(memcg)) {
> - mz = mem_cgroup_zoneinfo(memcg, nid, zid);
> + mz = mem_cgroup_page_zoneinfo(memcg, page);
> excess = res_counter_soft_limit_excess(&memcg->res);
> /*
> * We have to update the tree if mz is on RB-tree or
> @@ -805,14 +805,14 @@ static void mem_cgroup_update_tree(struct mem_cgroup *memcg, struct page *page)
>
> static void mem_cgroup_remove_from_trees(struct mem_cgroup *memcg)
> {
> - int node, zone;
> - struct mem_cgroup_per_zone *mz;
> struct mem_cgroup_tree_per_zone *mctz;
> + struct mem_cgroup_per_zone *mz;
> + int nid, zid;
>
> - for_each_node(node) {
> - for (zone = 0; zone < MAX_NR_ZONES; zone++) {
> - mz = mem_cgroup_zoneinfo(memcg, node, zone);
> - mctz = soft_limit_tree_node_zone(node, zone);
> + for_each_node(nid) {
> + for (zid = 0; zid < MAX_NR_ZONES; zid++) {
> + mz = &memcg->nodeinfo[nid]->zoneinfo[zid];
> + mctz = soft_limit_tree_node_zone(nid, zid);
> mem_cgroup_remove_exceeded(memcg, mz, mctz);
> }
> }
> @@ -947,8 +947,7 @@ static void mem_cgroup_charge_statistics(struct mem_cgroup *memcg,
> __this_cpu_add(memcg->stat->nr_page_events, nr_pages);
> }
>
> -unsigned long
> -mem_cgroup_get_lru_size(struct lruvec *lruvec, enum lru_list lru)
> +unsigned long mem_cgroup_get_lru_size(struct lruvec *lruvec, enum lru_list lru)
> {
> struct mem_cgroup_per_zone *mz;
>
> @@ -956,46 +955,38 @@ mem_cgroup_get_lru_size(struct lruvec *lruvec, enum lru_list lru)
> return mz->lru_size[lru];
> }
>
> -static unsigned long
> -mem_cgroup_zone_nr_lru_pages(struct mem_cgroup *memcg, int nid, int zid,
> - unsigned int lru_mask)
> -{
> - struct mem_cgroup_per_zone *mz;
> - enum lru_list lru;
> - unsigned long ret = 0;
> -
> - mz = mem_cgroup_zoneinfo(memcg, nid, zid);
> -
> - for_each_lru(lru) {
> - if (BIT(lru) & lru_mask)
> - ret += mz->lru_size[lru];
> - }
> - return ret;
> -}
> -
> -static unsigned long
> -mem_cgroup_node_nr_lru_pages(struct mem_cgroup *memcg,
> - int nid, unsigned int lru_mask)
> +static unsigned long mem_cgroup_node_nr_lru_pages(struct mem_cgroup *memcg,
> + int nid,
> + unsigned int lru_mask)
> {
> - u64 total = 0;
> + unsigned long nr = 0;
> int zid;
>
> - for (zid = 0; zid < MAX_NR_ZONES; zid++)
> - total += mem_cgroup_zone_nr_lru_pages(memcg,
> - nid, zid, lru_mask);
> + VM_BUG_ON((unsigned)nid >= nr_node_ids);
> +
> + for (zid = 0; zid < MAX_NR_ZONES; zid++) {
> + struct mem_cgroup_per_zone *mz;
> + enum lru_list lru;
>
> - return total;
> + for_each_lru(lru) {
> + if (!(BIT(lru) & lru_mask))
> + continue;
> + mz = &memcg->nodeinfo[nid]->zoneinfo[zid];
> + nr += mz->lru_size[lru];
> + }
> + }
> + return nr;
> }
>
> static unsigned long mem_cgroup_nr_lru_pages(struct mem_cgroup *memcg,
> unsigned int lru_mask)
> {
> + unsigned long nr = 0;
> int nid;
> - u64 total = 0;
>
> for_each_node_state(nid, N_MEMORY)
> - total += mem_cgroup_node_nr_lru_pages(memcg, nid, lru_mask);
> - return total;
> + nr += mem_cgroup_node_nr_lru_pages(memcg, nid, lru_mask);
> + return nr;
> }
>
> static bool mem_cgroup_event_ratelimit(struct mem_cgroup *memcg,
> @@ -1234,11 +1225,9 @@ struct mem_cgroup *mem_cgroup_iter(struct mem_cgroup *root,
> int uninitialized_var(seq);
>
> if (reclaim) {
> - int nid = zone_to_nid(reclaim->zone);
> - int zid = zone_idx(reclaim->zone);
> struct mem_cgroup_per_zone *mz;
>
> - mz = mem_cgroup_zoneinfo(root, nid, zid);
> + mz = mem_cgroup_zone_zoneinfo(root, reclaim->zone);
> iter = &mz->reclaim_iter[reclaim->priority];
> if (prev && reclaim->generation != iter->generation) {
> iter->last_visited = NULL;
> @@ -1345,7 +1334,7 @@ struct lruvec *mem_cgroup_zone_lruvec(struct zone *zone,
> goto out;
> }
>
> - mz = mem_cgroup_zoneinfo(memcg, zone_to_nid(zone), zone_idx(zone));
> + mz = mem_cgroup_zone_zoneinfo(memcg, zone);
> lruvec = &mz->lruvec;
> out:
> /*
> @@ -1404,7 +1393,7 @@ struct lruvec *mem_cgroup_page_lruvec(struct page *page, struct zone *zone)
> if (!PageLRU(page) && !PageCgroupUsed(pc) && memcg != root_mem_cgroup)
> pc->mem_cgroup = memcg = root_mem_cgroup;
>
> - mz = page_cgroup_zoneinfo(memcg, page);
> + mz = mem_cgroup_page_zoneinfo(memcg, page);
> lruvec = &mz->lruvec;
> out:
> /*
> @@ -5412,7 +5401,7 @@ static int memcg_stat_show(struct seq_file *m, void *v)
>
> for_each_online_node(nid)
> for (zid = 0; zid < MAX_NR_ZONES; zid++) {
> - mz = mem_cgroup_zoneinfo(memcg, nid, zid);
> + mz = &memcg->nodeinfo[nid]->zoneinfo[zid];
> rstat = &mz->lruvec.reclaim_stat;
>
> recent_rotated[0] += rstat->recent_rotated[0];
> --
> 1.9.2
>
>
--
Michal Hocko
SUSE Labs
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