From: Johannes Thumshirn <Johannes.Thumshirn@wdc.com>
To: Christoph Hellwig <hch@infradead.org>,
"dsterba@suse.cz" <dsterba@suse.cz>,
David Sterba <dsterba@suse.com>,
Nikolay Borisov <nborisov@suse.com>,
"linux-btrfs @ vger . kernel . org" <linux-btrfs@vger.kernel.org>
Subject: Re: [PATCH v3 0/5] btrfs: remove buffer heads form superblock handling
Date: Thu, 30 Jan 2020 15:53:37 +0000 [thread overview]
Message-ID: <DM5PR0401MB35915F7AE2B1A679213ED4AD9B040@DM5PR0401MB3591.namprd04.prod.outlook.com> (raw)
In-Reply-To: 20200130133921.GA21841@infradead.org
On 30/01/2020 14:39, Christoph Hellwig wrote:
> On Thu, Jan 30, 2020 at 01:15:30PM +0100, David Sterba wrote:
>>> Sure but with hch's proposed change to using read_cache_page_gfp() this
>>> doesn't make too much sense anymore at least for the read path.
>>>
>>> Maybe "use page cache for superblock reading"?
>>
>> That works too. We might need a new iteration that summarizes up all the
>> feedback so far, so we have same code to refer to.
>
> Per my question on the second patch: why even use the page cache at
> all. btrfs already caches the value outside the pagecache, so why
> even bother with the page cache overhead?
>
This is what my first version did, alloc_page() and submit_bio()
directly [1]. But reviewers told me to go the route via page cache.
[1]
https://lore.kernel.org/linux-btrfs/20200117125105.20989-1-johannes.thumshirn@wdc.com/
next prev parent reply other threads:[~2020-01-30 15:53 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-27 15:59 [PATCH v3 0/5] btrfs: remove buffer heads form superblock handling Johannes Thumshirn
2020-01-27 15:59 ` [PATCH v3 1/5] btrfs: remove buffer heads from super block reading Johannes Thumshirn
2020-01-28 11:47 ` Christoph Hellwig
2020-01-30 10:12 ` Johannes Thumshirn
2020-01-27 15:59 ` [PATCH v3 2/5] btrfs: remove use of buffer_heads from superblock writeout Johannes Thumshirn
2020-01-28 11:52 ` Christoph Hellwig
2020-01-27 15:59 ` [PATCH v3 3/5] btrfs: remove btrfsic_submit_bh() Johannes Thumshirn
2020-01-27 15:59 ` [PATCH v3 4/5] btrfs: remove buffer_heads from btrfsic_process_written_block() Johannes Thumshirn
2020-01-27 15:59 ` [PATCH v3 5/5] btrfs: remove buffer_heads form superblock mirror integrity checking Johannes Thumshirn
2020-01-29 14:25 ` [PATCH v3 0/5] btrfs: remove buffer heads form superblock handling David Sterba
2020-01-30 11:23 ` Johannes Thumshirn
2020-01-30 12:15 ` David Sterba
2020-01-30 13:39 ` Christoph Hellwig
2020-01-30 15:53 ` Johannes Thumshirn [this message]
2020-01-30 15:56 ` Christoph Hellwig
2020-01-30 16:09 ` Johannes Thumshirn
2020-01-30 16:15 ` Christoph Hellwig
2020-01-30 16:16 ` David Sterba
2020-01-31 13:43 ` Johannes Thumshirn
2020-02-03 8:29 ` Christoph Hellwig
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