From: Shakeel Butt <shakeelb@google.com>
To: Kefeng Wang <wangkefeng.wang@huawei.com>
Cc: Christoph Lameter <cl@linux.com>,
Pekka Enberg <penberg@kernel.org>,
David Rientjes <rientjes@google.com>,
Vlastimil Babka <vbabka@suse.cz>, Michal Hocko <mhocko@suse.com>,
Roman Gushchin <guro@fb.com>, Wang Hai <wanghai38@huawei.com>,
Muchun Song <songmuchun@bytedance.com>,
Andrew Morton <akpm@linux-foundation.org>,
Linux MM <linux-mm@kvack.org>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] slub: fix unreclaimable slab stat for bulk free
Date: Thu, 29 Jul 2021 07:03:17 -0700 [thread overview]
Message-ID: <CALvZod6usxk99KFhQVXGxBadsYpUyQ3QuwfSDa_sbqSLjBEgnA@mail.gmail.com> (raw)
In-Reply-To: <8c14efe2-69dc-6eab-3cd5-c042576770e7@huawei.com>
On Wed, Jul 28, 2021 at 11:52 PM Kefeng Wang <wangkefeng.wang@huawei.com> wrote:
>
>
> On 2021/7/28 23:53, Shakeel Butt wrote:
> > SLUB uses page allocator for higher order allocations and update
> > unreclaimable slab stat for such allocations. At the moment, the bulk
> > free for SLUB does not share code with normal free code path for these
> > type of allocations and have missed the stat update. So, fix the stat
> > update by common code. The user visible impact of the bug is the
> > potential of inconsistent unreclaimable slab stat visible through
> > meminfo and vmstat.
> >
> > Fixes: 6a486c0ad4dc ("mm, sl[ou]b: improve memory accounting")
> > Signed-off-by: Shakeel Butt <shakeelb@google.com>
> > ---
> > mm/slub.c | 22 ++++++++++++----------
> > 1 file changed, 12 insertions(+), 10 deletions(-)
> >
> > diff --git a/mm/slub.c b/mm/slub.c
> > index 6dad2b6fda6f..03770291aa6b 100644
> > --- a/mm/slub.c
> > +++ b/mm/slub.c
> > @@ -3238,6 +3238,16 @@ struct detached_freelist {
> > struct kmem_cache *s;
> > };
> >
> > +static inline void free_nonslab_page(struct page *page)
> > +{
> > + unsigned int order = compound_order(page);
> > +
> > + VM_BUG_ON_PAGE(!PageCompound(page), page);
>
> Could we add WARN_ON here, or we got nothing when CONFIG_DEBUG_VM is
> disabled.
I don't have a strong opinion on this. Please send a patch with
reasoning if you want WARN_ON_ONCE here.
next prev parent reply other threads:[~2021-07-29 14:10 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-28 15:53 [PATCH] slub: fix unreclaimable slab stat for bulk free Shakeel Butt
2021-07-28 16:45 ` Michal Hocko
2021-07-28 23:30 ` Roman Gushchin
2021-07-29 5:40 ` Muchun Song
2021-07-29 6:52 ` Kefeng Wang
2021-07-29 14:03 ` Shakeel Butt [this message]
2021-08-03 14:24 ` Kefeng Wang
2021-08-03 14:29 ` Vlastimil Babka
2021-08-03 14:44 ` Kefeng Wang
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=CALvZod6usxk99KFhQVXGxBadsYpUyQ3QuwfSDa_sbqSLjBEgnA@mail.gmail.com \
--to=shakeelb@google.com \
--cc=akpm@linux-foundation.org \
--cc=cl@linux.com \
--cc=guro@fb.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=mhocko@suse.com \
--cc=penberg@kernel.org \
--cc=rientjes@google.com \
--cc=songmuchun@bytedance.com \
--cc=vbabka@suse.cz \
--cc=wanghai38@huawei.com \
--cc=wangkefeng.wang@huawei.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.