From: Christoph Hellwig <hch@infradead.org>
To: Logan Gunthorpe <logang@deltatee.com>
Cc: linux-kernel@vger.kernel.org, linux-raid@vger.kernel.org,
Song Liu <song@kernel.org>, Shaohua Li <shli@kernel.org>,
Guoqing Jiang <guoqing.jiang@linux.dev>,
Stephen Bates <sbates@raithlin.com>,
Martin Oliveira <Martin.Oliveira@eideticom.com>,
David Sloan <David.Sloan@eideticom.com>
Subject: Re: [PATCH v1 3/8] md/raid5: Move common stripe count increment code into __find_stripe()
Date: Thu, 7 Apr 2022 23:01:53 -0700 [thread overview]
Message-ID: <Yk/P0e6E7uVLkMnZ@infradead.org> (raw)
In-Reply-To: <20220407164511.8472-4-logang@deltatee.com>
On Thu, Apr 07, 2022 at 10:45:06AM -0600, Logan Gunthorpe wrote:
> static struct stripe_head *__find_stripe(struct r5conf *conf, sector_t sector,
> - short generation)
> + short generation, int hash)
> {
> + int inc_empty_inactive_list_flag;
> struct stripe_head *sh;
>
> pr_debug("__find_stripe, sector %llu\n", (unsigned long long)sector);
> hlist_for_each_entry(sh, stripe_hash(conf, sector), hash)
> if (sh->sector == sector && sh->generation == generation)
> - return sh;
> + goto found;
> pr_debug("__stripe %llu not in cache\n", (unsigned long long)sector);
> return NULL;
> +
> +found:
> + if (!atomic_inc_not_zero(&sh->count)) {
There is a way on list iterators outside the loop body waging right
now. So maybe just leave __find_stripe as-is and add a new
find_get_stripe that wraps it. And then just return early when the
atomic_inc_not_zero dos not succeed and save on one level of
indentation.
next prev parent reply other threads:[~2022-04-08 6:02 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-04-07 16:45 [PATCH v1 0/8] Improve Raid5 Lock Contention Logan Gunthorpe
2022-04-07 16:45 ` [PATCH v1 1/8] md/raid5: Refactor raid5_make_request loop Logan Gunthorpe
2022-04-08 5:58 ` Christoph Hellwig
2022-04-07 16:45 ` [PATCH v1 2/8] md/raid5: Move stripe_add_to_batch_list() call out of add_stripe_bio() Logan Gunthorpe
2022-04-08 6:00 ` Christoph Hellwig
2022-04-07 16:45 ` [PATCH v1 3/8] md/raid5: Move common stripe count increment code into __find_stripe() Logan Gunthorpe
2022-04-08 6:01 ` Christoph Hellwig [this message]
2022-04-07 16:45 ` [PATCH v1 4/8] md/raid5: Make common label for schedule/retry in raid5_make_request() Logan Gunthorpe
2022-04-08 6:03 ` Christoph Hellwig
2022-04-07 16:45 ` [PATCH v1 5/8] md/raid5: Keep a reference to last stripe_head for batch Logan Gunthorpe
2022-04-07 16:45 ` [PATCH v1 6/8] md/raid5: Refactor add_stripe_bio() Logan Gunthorpe
2022-04-08 6:05 ` Christoph Hellwig
2022-04-07 16:45 ` [PATCH v1 7/8] md/raid5: Check all disks in a stripe_head for reshape progress Logan Gunthorpe
2022-04-07 16:45 ` [PATCH v1 8/8] md/raid5: Pivot raid5_make_request() Logan Gunthorpe
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