From: Vasily Averin <vvs@virtuozzo.com>
To: Shakeel Butt <shakeelb@google.com>,
Johannes Weiner <hannes@cmpxchg.org>,
Michal Hocko <mhocko@kernel.org>,
Mel Gorman <mgorman@techsingularity.net>
Cc: Uladzislau Rezki <urezki@gmail.com>, Roman Gushchin <guro@fb.com>,
Andrew Morton <akpm@linux-foundation.org>,
cgroups@vger.kernel.org, linux-mm@kvack.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] memcg: page_alloc: skip bulk allocator for __GFP_ACCOUNT
Date: Thu, 14 Oct 2021 10:05:21 +0300 [thread overview]
Message-ID: <4c92e227-2abc-c3cb-93eb-f5c45bef7fc6@virtuozzo.com> (raw)
In-Reply-To: <20211013194338.1804247-1-shakeelb@google.com>
On 13.10.2021 22:43, Shakeel Butt wrote:
> The commit 5c1f4e690eec ("mm/vmalloc: switch to bulk allocator in
> __vmalloc_area_node()") switched to bulk page allocator for order 0
> allocation backing vmalloc. However bulk page allocator does not support
> __GFP_ACCOUNT allocations and there are several users of
> kvmalloc(__GFP_ACCOUNT).
>
> For now make __GFP_ACCOUNT allocations bypass bulk page allocator. In
> future if there is workload that can be significantly improved with the
> bulk page allocator with __GFP_ACCCOUNT support, we can revisit the
> decision.
>
> Fixes: 5c1f4e690eec ("mm/vmalloc: switch to bulk allocator in __vmalloc_area_node()")
> Signed-off-by: Shakeel Butt <shakeelb@google.com>
> ---
> mm/page_alloc.c | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> index 668edb16446a..b3acad4615d3 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -5215,6 +5215,10 @@ unsigned long __alloc_pages_bulk(gfp_t gfp, int preferred_nid,
> unsigned int alloc_flags = ALLOC_WMARK_LOW;
> int nr_populated = 0, nr_account = 0;
>
> + /* Bulk allocator does not support memcg accounting. */
> + if (unlikely(gfp & __GFP_ACCOUNT))
> + goto out;
> +
May be (memcg_kmem_enabled() && (gfp & __GFP_ACCOUNT)) check is better here?
> /*
> * Skip populated array elements to determine if any pages need
> * to be allocated before disabling IRQs.
>
next prev parent reply other threads:[~2021-10-14 7:05 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-13 19:43 [PATCH] memcg: page_alloc: skip bulk allocator for __GFP_ACCOUNT Shakeel Butt
2021-10-13 22:03 ` Roman Gushchin
2021-10-13 22:26 ` Shakeel Butt
2021-10-13 23:15 ` Roman Gushchin
2021-10-13 23:45 ` Shakeel Butt
2021-10-14 0:06 ` Roman Gushchin
2021-10-14 0:08 ` Matthew Wilcox
2021-10-14 7:05 ` Vasily Averin [this message]
2021-10-14 7:18 ` Michal Hocko
2021-10-14 7:16 ` Michal Hocko
2021-10-14 15:01 ` Shakeel Butt
2021-10-14 15:13 ` Michal Hocko
2021-10-14 15:23 ` Johannes Weiner
2021-10-14 17:43 ` Vasily Averin
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