From: Christoph Hellwig <hch@infradead.org>
To: Jens Axboe <axboe@fb.com>
Cc: Christoph Hellwig <hch@infradead.org>,
axboe@kernel.dk, linux-block@vger.kernel.org
Subject: Re: [PATCHSET] Add support for simplified async direct-io
Date: Mon, 14 Nov 2016 10:05:03 -0800 [thread overview]
Message-ID: <20161114180503.GA31126@infradead.org> (raw)
In-Reply-To: <4f30a528-9996-4c6a-9513-8aa2054e4d4b@fb.com>
On Mon, Nov 14, 2016 at 11:02:47AM -0700, Jens Axboe wrote:
> > We need it unless we want unbounded allocations for the biovec. With a
> > 1GB I/O we're at a page size allocation, and with 64MB I/Os that aren't
> > unheard of we'd be up to a 64 pages or an order 6 allocation which will
> > take down the VM. We also need to pin down all the user memory while
> > doing the I/O instead of having throttling on the bio mempool before
> > doing the get_user_pages.
>
> Just add the iterator and loop for every X pages? We can even put a plug
> around it, if we have to.
That's pretty much what my patch does..
next prev parent reply other threads:[~2016-11-14 18:05 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-11-14 17:28 [PATCHSET] Add support for simplified async direct-io Jens Axboe
2016-11-14 17:28 ` [PATCH 1/2] block: support any sized IO for simplified bdev direct-io Jens Axboe
2016-11-14 17:28 ` [PATCH 2/2] block: add support for async simple direct-io for bdevs Jens Axboe
2016-11-14 17:37 ` [PATCHSET] Add support for simplified async direct-io Christoph Hellwig
2016-11-14 17:47 ` Jens Axboe
2016-11-14 18:00 ` Christoph Hellwig
2016-11-14 18:02 ` Jens Axboe
2016-11-14 18:05 ` Christoph Hellwig [this message]
2016-11-14 18:08 ` Jens Axboe
2016-11-14 18:11 ` Christoph Hellwig
2016-11-14 18:17 ` Jens Axboe
2016-11-15 13:58 ` Christoph Hellwig
2016-11-16 16:09 ` Jens Axboe
2016-11-16 16:31 ` Christoph Hellwig
2016-11-16 16:57 ` Jens Axboe
2016-11-16 17:16 ` Christoph Hellwig
2016-11-16 20:02 ` Jens Axboe
2016-11-16 20:36 ` Jens Axboe
2016-11-16 20:51 ` Jens Axboe
2016-11-17 3:44 ` Jens Axboe
2016-11-17 4:43 ` Jens Axboe
2016-11-17 12:50 ` Christoph Hellwig
2016-11-17 13:25 ` Jens Axboe
2016-11-17 15:03 ` Jens Axboe
2016-11-17 15:16 ` Christoph Hellwig
2016-11-17 20:17 ` Christoph Hellwig
2016-11-17 20:30 ` Jens Axboe
2016-11-17 21:04 ` Christoph Hellwig
2016-11-17 21:06 ` Jens Axboe
2016-11-17 12:46 ` Christoph Hellwig
2016-11-17 13:26 ` Jens Axboe
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