From: David Hildenbrand <david@redhat.com>
To: 贺中坤 <hezhongkun.hzk@bytedance.com>
Cc: minchan@kernel.org, senozhatsky@chromium.org, mhocko@suse.com,
linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: [External] Re: [RFC PATCH 1/3] zram: charge the compressed RAM to the page's memcgroup
Date: Thu, 15 Jun 2023 14:56:55 +0200 [thread overview]
Message-ID: <bd119703-7b7b-c4ab-0c38-9b85809de252@redhat.com> (raw)
In-Reply-To: <CACSyD1OxAMowHTE7KnL8nac_-=Vp4eyO00oyMLFo0qcEHx33GA@mail.gmail.com>
On 15.06.23 14:19, 贺中坤 wrote:
> On Thu, Jun 15, 2023 at 7:19 PM David Hildenbrand <david@redhat.com> wrote:
>>
>> Yes, but my point is that there are cases where the pages you get are
>> not charged. zram_bvec_write_partial() is just one such example that
>> highlights the issue.
>
> Sorry ,I got it.
I suspect for the swap->zram we should always get charged pages, because
we're effectively writing out charged anon/shmem pages only -- without
any buffer in between.
For the fs->zram or direct zram access device case I'm not so sure. It
highly depends on what gets mapped into the bio (e.g., a kernel buffer,
zeropage, ...). If it's a pagecache page, that should be charged and
we're good. No so sure about fs metadata or some other fs cases (e.g.,
write() to a file that bypass the pagecache).
--
Cheers,
David / dhildenb
next prev parent reply other threads:[~2023-06-15 12:57 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-06-15 3:48 Zhongkun He
2023-06-15 4:59 ` Yu Zhao
2023-06-15 8:57 ` Fabian Deutsch
2023-06-15 10:00 ` [External] " 贺中坤
2023-06-15 12:14 ` Fabian Deutsch
2023-06-16 1:39 ` Yosry Ahmed
2023-06-16 4:40 ` [External] " 贺中坤
2023-06-16 7:37 ` Yosry Ahmed
2023-06-16 7:57 ` David Hildenbrand
2023-06-16 8:04 ` Yosry Ahmed
2023-06-16 8:37 ` David Hildenbrand
2023-06-16 8:39 ` Yosry Ahmed
2023-06-15 9:32 ` Fabian Deutsch
2023-06-15 9:41 ` [External] " 贺中坤
2023-06-15 9:27 ` David Hildenbrand
2023-06-15 11:15 ` [External] " 贺中坤
2023-06-15 11:19 ` David Hildenbrand
2023-06-15 12:19 ` 贺中坤
2023-06-15 12:56 ` David Hildenbrand [this message]
2023-06-15 13:40 ` 贺中坤
2023-06-15 14:46 ` David Hildenbrand
2023-06-16 3:44 ` 贺中坤
2023-06-15 9:35 ` Michal Hocko
2023-06-15 11:58 ` [External] " 贺中坤
2023-06-15 12:16 ` Michal Hocko
2023-06-15 13:09 ` 贺中坤
2023-06-15 13:27 ` Michal Hocko
2023-06-15 14:13 ` 贺中坤
2023-06-15 14:20 ` Michal Hocko
2023-06-16 3:31 ` 贺中坤
2023-06-16 6:40 ` Michal Hocko
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