From: Minchan Kim <minchan@kernel.org>
To: Christoph Hellwig <hch@infradead.org>
Cc: Pankaj Raghav <p.raghav@samsung.com>,
martin@omnibond.com, axboe@kernel.dk, akpm@linux-foundation.org,
hubcap@omnibond.com, willy@infradead.org,
viro@zeniv.linux.org.uk, senozhatsky@chromium.org,
brauner@kernel.org, linux-kernel@vger.kernel.org,
linux-fsdevel@vger.kernel.org, mcgrof@kernel.org,
linux-block@vger.kernel.org, gost.dev@samsung.com,
linux-mm@kvack.org, devel@lists.orangefs.org
Subject: Re: [PATCH 1/5] zram: remove the call to page_endio in the bio end_io handler
Date: Thu, 30 Mar 2023 18:42:38 -0700 [thread overview]
Message-ID: <ZCY6jsKdhOXGkYYT@google.com> (raw)
In-Reply-To: <ZCYYSdpmWRJynC6d@infradead.org>
On Thu, Mar 30, 2023 at 04:16:25PM -0700, Christoph Hellwig wrote:
> On Thu, Mar 30, 2023 at 03:51:54PM -0700, Minchan Kim wrote:
> > > to remove the call to page_endio() function that unlocks or marks
> > > writeback end on the page.
> > >
> > > Rename the endio handler from zram_page_end_io to zram_read_end_io as
> > > the call to page_endio() is removed and to associate the callback to the
> > > operation it is used in.
> >
> > Since zram removed the rw_page and IO comes with bio from now on,
> > IIUC, we are fine since every IO will go with chained-IO. Right?
>
> writeback_store callszram_bvec_read with a NULL bio, that is it just
> fires off an async read without any synchronization.
It should go under zram_read_from_zspool, not zram_bvec_read_from_bdev.
The ZRAM_UNDER_WB and ZRAM_WB under zram_slot_lock should synchronize.
next prev parent reply other threads:[~2023-03-31 1:42 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CGME20230328112717eucas1p2eb9395b7e3334c08aa28740b0af46fe9@eucas1p2.samsung.com>
2023-03-28 11:27 ` [PATCH 0/5] remove page_endio() Pankaj Raghav
[not found] ` <CGME20230328112718eucas1p214a859cfb3d7b45523356bcc16c373b1@eucas1p2.samsung.com>
2023-03-28 11:27 ` [PATCH 1/5] zram: remove the call to page_endio in the bio end_io handler Pankaj Raghav
2023-03-28 15:19 ` Matthew Wilcox
2023-03-28 16:17 ` Pankaj Raghav
2023-03-29 23:53 ` Christoph Hellwig
2023-03-30 22:51 ` Minchan Kim
2023-03-30 23:16 ` Christoph Hellwig
2023-03-31 1:42 ` Minchan Kim [this message]
2023-03-31 11:19 ` Pankaj Raghav
[not found] ` <CGME20230328112718eucas1p263dacecb2a59f5fce510f81685f9d497@eucas1p2.samsung.com>
2023-03-28 11:27 ` [PATCH 2/5] orangefs: use folios in orangefs_readahead Pankaj Raghav
2023-03-28 15:21 ` Matthew Wilcox
2023-03-28 16:02 ` Pankaj Raghav
2023-03-29 19:10 ` Mike Marshall
[not found] ` <CGME20230328112719eucas1p2b0f94ad7b06990203081d2b125dfc6ac@eucas1p2.samsung.com>
2023-03-28 11:27 ` [PATCH 3/5] mpage: split bi_end_io callback for reads and writes Pankaj Raghav
[not found] ` <CGME20230328112720eucas1p1148c03b8664f6c212c7189454a36b796@eucas1p1.samsung.com>
2023-03-28 11:27 ` [PATCH 4/5] mpage: use folios in bio end_io handler Pankaj Raghav
[not found] ` <CGME20230328112720eucas1p2bbb42b49da00b4f2299049bf6bafce48@eucas1p2.samsung.com>
2023-03-28 11:27 ` [PATCH 5/5] filemap: remove page_endio() Pankaj Raghav
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