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Date: Mon, 18 Oct 2021 10:08:27 +0200
From: Michal Hocko <mhocko@...e.com>
To: linux-kernel@...r.kernel.org
Cc: david@...hat.com, guro@...com, hannes@...xchg.org,
mm-commits@...r.kernel.org, stable@...r.kernel.org,
vvs@...tuozzo.com
Subject: Re: + memcg-enable-memory-accounting-in-__alloc_pages_bulk.patch
added to -mm tree
On Fri 15-10-21 14:34:21, Andrew Morton wrote:
>
> The patch titled
> Subject: memcg: enable memory accounting in __alloc_pages_bulk
> has been added to the -mm tree. Its filename is
> memcg-enable-memory-accounting-in-__alloc_pages_bulk.patch
>
> This patch should soon appear at
> https://ozlabs.org/~akpm/mmots/broken-out/memcg-enable-memory-accounting-in-__alloc_pages_bulk.patch
> and later at
> https://ozlabs.org/~akpm/mmotm/broken-out/memcg-enable-memory-accounting-in-__alloc_pages_bulk.patch
>
> Before you just go and hit "reply", please:
> a) Consider who else should be cc'ed
> b) Prefer to cc a suitable mailing list as well
> c) Ideally: find the original patch on the mailing list and do a
> reply-to-all to that, adding suitable additional cc's
>
> *** Remember to use Documentation/process/submit-checklist.rst when testing your code ***
>
> The -mm tree is included into linux-next and is updated
> there every 3-4 working days
>
> ------------------------------------------------------
> From: Vasily Averin <vvs@...tuozzo.com>
> Subject: memcg: enable memory accounting in __alloc_pages_bulk
>
> Bulk page allocator is used in vmalloc where it can be called
> with __GFP_ACCOUNT and must charge allocated pages into memory cgroup.
>
> Link: https://lkml.kernel.org/r/65c1afaf-7947-ce28-55b7-06bde7aeb278@virtuozzo.com
> Fixes: 387ba26fb1cb ("mm/page_alloc: add a bulk page allocator")
> Signed-off-by: Vasily Averin <vvs@...tuozzo.com>
> Acked-by: David Hildenbrand <david@...hat.com>
> Acked-by: Michal Hocko <mhocko@...e.com>
I haven't acked this patch. Have you mixed this with Shakeel's patch
http://lkml.kernel.org/r/20211014151607.2171970-1-shakeelb@google.com?
> Acked-by: Roman Gushchin <guro@...com>
> Acked-by: Johannes Weiner <hannes@...xchg.org>
> Cc: <stable@...r.kernel.org>
> Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
> ---
>
> include/linux/memcontrol.h | 9 ++++++
> mm/memcontrol.c | 50 +++++++++++++++++++++++++++++++++++
> mm/page_alloc.c | 12 +++++++-
> 3 files changed, 69 insertions(+), 2 deletions(-)
>
> --- a/include/linux/memcontrol.h~memcg-enable-memory-accounting-in-__alloc_pages_bulk
> +++ a/include/linux/memcontrol.h
> @@ -1692,6 +1692,9 @@ static inline int memcg_cache_id(struct
>
> struct mem_cgroup *mem_cgroup_from_obj(void *p);
>
> +int memcg_charge_bulk_pages(gfp_t gfp, int nr_pages,
> + struct list_head *page_list,
> + struct page **page_array);
> #else
> static inline bool mem_cgroup_kmem_disabled(void)
> {
> @@ -1744,6 +1747,12 @@ static inline struct mem_cgroup *mem_cgr
> return NULL;
> }
>
> +int memcg_charge_bulk_pages(gfp_t gfp, int nr_pages,
> + struct list_head *page_list,
> + struct page **page_array)
> +{
> + return 0;
> +}
> #endif /* CONFIG_MEMCG_KMEM */
>
> #endif /* _LINUX_MEMCONTROL_H */
> --- a/mm/memcontrol.c~memcg-enable-memory-accounting-in-__alloc_pages_bulk
> +++ a/mm/memcontrol.c
> @@ -3288,6 +3288,56 @@ void obj_cgroup_uncharge(struct obj_cgro
> refill_obj_stock(objcg, size, true);
> }
>
> +/*
> + * memcg_charge_bulk_pages - Charge pages allocated by bulk allocator
> + * @gfp: GFP flags for the allocation
> + * @nr_pages: The number of pages added into the list or array
> + * @page_list: Optional list of allocated pages
> + * @page_array: Optional array of allocated pages
> + *
> + * Walks through array or list of allocated pages.
> + * For each page tries to charge it.
> + * If charge fails removes page from of array/list, frees it,
> + * and repeat it till end of array/list
> + *
> + * Returns the number of freed pages.
> + */
> +int memcg_charge_bulk_pages(gfp_t gfp, int nr_pages,
> + struct list_head *page_list,
> + struct page **page_array)
> +{
> + struct page *page, *np = NULL;
> + bool charge = true;
> + int i, nr_freed = 0;
> +
> + if (page_list)
> + page = list_first_entry(page_list, struct page, lru);
> +
> + for (i = 0; i < nr_pages; i++) {
> + if (page_list) {
> + if (np)
> + page = np;
> + np = list_next_entry(page, lru);
> + } else {
> + page = page_array[i];
> + }
> + /* some pages in incoming array can be charged already */
> + if (!page->memcg_data) {
> + if (charge && __memcg_kmem_charge_page(page, gfp, 0))
> + charge = false;
> +
> + if (!charge) {
> + if (page_list)
> + list_del(&page->lru);
> + else
> + page_array[i] = NULL;
> + __free_pages(page, 0);
> + nr_freed++;
> + }
> + }
> + }
> + return nr_freed;
> +}
> #endif /* CONFIG_MEMCG_KMEM */
>
> /*
> --- a/mm/page_alloc.c~memcg-enable-memory-accounting-in-__alloc_pages_bulk
> +++ a/mm/page_alloc.c
> @@ -5203,10 +5203,11 @@ unsigned long __alloc_pages_bulk(gfp_t g
> struct zoneref *z;
> struct per_cpu_pages *pcp;
> struct list_head *pcp_list;
> + LIST_HEAD(tpl);
> struct alloc_context ac;
> gfp_t alloc_gfp;
> unsigned int alloc_flags = ALLOC_WMARK_LOW;
> - int nr_populated = 0, nr_account = 0;
> + int nr_populated = 0, nr_account = 0, nr_freed = 0;
>
> /*
> * Skip populated array elements to determine if any pages need
> @@ -5300,7 +5301,7 @@ unsigned long __alloc_pages_bulk(gfp_t g
>
> prep_new_page(page, 0, gfp, 0);
> if (page_list)
> - list_add(&page->lru, page_list);
> + list_add(&page->lru, &tpl);
> else
> page_array[nr_populated] = page;
> nr_populated++;
> @@ -5308,6 +5309,13 @@ unsigned long __alloc_pages_bulk(gfp_t g
>
> local_unlock_irqrestore(&pagesets.lock, flags);
>
> + if (memcg_kmem_enabled() && (gfp & __GFP_ACCOUNT) && nr_account)
> + nr_freed = memcg_charge_bulk_pages(gfp, nr_populated,
> + page_list ? &tpl : NULL,
> + page_array);
> + nr_account -= nr_freed;
> + nr_populated -= nr_freed;
> + list_splice(&tpl, page_list);
> __count_zid_vm_events(PGALLOC, zone_idx(zone), nr_account);
> zone_statistics(ac.preferred_zoneref->zone, zone, nr_account);
>
> _
>
> Patches currently in -mm which might be from vvs@...tuozzo.com are
>
> memcg-prohibit-unconditional-exceeding-the-limit-of-dying-tasks.patch
> memcg-enable-memory-accounting-in-__alloc_pages_bulk.patch
> mm-vmalloc-repair-warn_allocs-in-__vmalloc_area_node.patch
> vmalloc-back-off-when-the-current-task-is-oom-killed.patch
--
Michal Hocko
SUSE Labs
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