From: Shaohua Li <shli@kernel.org>
To: NeilBrown <neilb@suse.com>
Cc: linux-raid@vger.kernel.org, hch@lst.de
Subject: Re: [md PATCH 00/15 v2] remove all abuse of bi_phys_segments
Date: Wed, 15 Mar 2017 18:12:12 -0700 [thread overview]
Message-ID: <20170316011212.ekibeyjc33vesb2t@kernel.org> (raw)
In-Reply-To: <148954692173.18641.1294690639716682540.stgit@noble>
On Wed, Mar 15, 2017 at 02:05:11PM +1100, Neil Brown wrote:
> This is a revised version of my series to remove all abuse of
> bi_phys_segments from md/raid.
>
> Most of the effort is for raid5 - raid1 and raid10 are
> comparatively straight forward.
>
> I've also include some optimization of md_write_start() which is now
> used more heavily. This now uses percpu-refcount, which needed a
> small modification.
looks quite good, there are some minor issues I replied separately.
> As noted in some of these changelogs, a couple of bugs are fixed
> in raid1/raid10. We should probably create fixes suitable for
> -stable.
At first glance, it seems not easy to create a stable fix. The
bio_inc_remaining only exists in several kernel versions. There isn't easy way
to fix the issue without the per-bio accounting mechanism.
> In this series there is a 'block' patch and a 'percpu-refcount' patch,
> which should probably go in through other trees. I might send those
> off as appropriate soonish.
Please do. The block patch could go other tree, as it's mostly separately. The
percpu-refcount patch could be a problem if it goes other tree.
Thanks,
Shaohua
prev parent reply other threads:[~2017-03-16 1:12 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-03-15 3:05 [md PATCH 00/15 v2] remove all abuse of bi_phys_segments NeilBrown
2017-03-15 3:05 ` [md PATCH 03/15] md/raid5: call bio_endio() directly rather than queueing for later NeilBrown
2017-03-15 3:05 ` [md PATCH 01/15] md/raid5: use md_write_start to count stripes, not bios NeilBrown
2017-03-15 3:05 ` [md PATCH 04/15] block: trace completion of all bios NeilBrown
2017-03-15 3:05 ` [md PATCH 02/15] md/raid5: simplfy delaying of writes while metadata is updated NeilBrown
2017-03-15 23:03 ` Shaohua Li
2017-03-16 2:45 ` NeilBrown
2017-03-22 1:40 ` Fix bug in " NeilBrown
2017-03-22 2:29 ` REALLY " NeilBrown
2017-03-22 2:35 ` NeilBrown
2017-03-23 2:22 ` Shaohua Li
2017-03-15 3:05 ` [md PATCH 06/15] md/raid5: remove over-loading of ->bi_phys_segments NeilBrown
2017-03-15 3:05 ` [md PATCH 09/15] md/raid10: stop using bi_phys_segments NeilBrown
2017-03-15 3:05 ` [md PATCH 05/15] md/raid5: use bio_inc_remaining() instead of repurposing bi_phys_segments as a counter NeilBrown
2017-03-15 3:05 ` [md PATCH 08/15] md/raid1, raid10: move rXbio accounting closer to allocation NeilBrown
2017-03-15 3:05 ` [md PATCH 07/15] Revert "md/raid5: limit request size according to implementation limits" NeilBrown
2017-03-15 3:05 ` [md PATCH 14/15] percpu-refcount: support synchronous switch to atomic mode NeilBrown
2017-03-15 3:05 ` [md PATCH 13/15] md: close a race with setting mddev->in_sync NeilBrown
2017-03-15 3:05 ` [md PATCH 15/15] MD: use per-cpu counter for writes_pending NeilBrown
2017-03-16 1:05 ` Shaohua Li
2017-03-16 2:57 ` NeilBrown
2017-03-22 1:55 ` Improvement for " NeilBrown
2017-03-22 2:34 ` IMPROVEMENT for " NeilBrown
2017-03-15 3:05 ` [md PATCH 11/15] md/raid5: don't test ->writes_pending in raid5_remove_disk NeilBrown
2017-03-15 3:05 ` [md PATCH 10/15] md/raid1: stop using bi_phys_segment NeilBrown
2017-03-16 0:13 ` Shaohua Li
2017-03-16 2:49 ` NeilBrown
2017-03-16 3:36 ` Shaohua Li
2017-03-22 1:41 ` Fix bugs in " NeilBrown
2017-03-15 3:05 ` [md PATCH 12/15] md: factor out set_in_sync() NeilBrown
2017-03-16 1:12 ` Shaohua Li [this message]
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