From: Logan Gunthorpe <logang@deltatee.com>
To: Paul Menzel <pmenzel@molgen.mpg.de>
Cc: linux-kernel@vger.kernel.org, linux-raid@vger.kernel.org,
Song Liu <song@kernel.org>, Christoph Hellwig <hch@infradead.org>,
Guoqing Jiang <guoqing.jiang@linux.dev>,
Stephen Bates <sbates@raithlin.com>,
Martin Oliveira <Martin.Oliveira@eideticom.com>,
David Sloan <David.Sloan@eideticom.com>,
Christoph Hellwig <hch@lst.de>
Subject: Re: [PATCH v2 01/12] md/raid5: Factor out ahead_of_reshape() function
Date: Thu, 21 Apr 2022 10:05:19 -0600 [thread overview]
Message-ID: <3252df44-5856-c1ed-174e-18748387cdd2@deltatee.com> (raw)
In-Reply-To: <b0bd9204-1f76-aba3-b754-464e28763f59@molgen.mpg.de>
On 2022-04-21 03:17, Paul Menzel wrote:
> Dear Logan,
>
>
> Thank you for these patches.
>
>
> Am 20.04.22 um 21:54 schrieb Logan Gunthorpe:
>> There are a few uses of an ugly ternary operator in raid5_make_request()
>> to check if a sector is a head of a reshape sector.
>>
>> Factor this out into a simple helper called ahead_of_reshape().
>>
>> This appears to fix the first bio_wouldblock_error() check which appears
>> to have comparison operators that didn't match the check below which
>> causes a schedule. Besides this, no functional changes intended.
>
> If there is an error, could that be fixed in a separate commit, which
> could be applied to the stable series?
Yes, sure. Though, I'm not 100% sure there's an error or noticeable bug.
It's just that the logic didn't match and it made cleaning up the code
overly complicated.
>
>> Suggested-by: Christoph Hellwig <hch@lst.de>
>> Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
>> ---
>> drivers/md/raid5.c | 29 +++++++++++++++++------------
>> 1 file changed, 17 insertions(+), 12 deletions(-)
>>
>> diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
>> index 7f7d1546b9ba..97b23c18402b 100644
>> --- a/drivers/md/raid5.c
>> +++ b/drivers/md/raid5.c
>> @@ -5787,6 +5787,15 @@ static void make_discard_request(struct mddev
>> *mddev, struct bio *bi)
>> bio_endio(bi);
>> }
>> +static bool ahead_of_reshape(struct mddev *mddev, sector_t sector,
>> + sector_t reshape_sector)
>> +{
>> + if (mddev->reshape_backwards)
>> + return sector < reshape_sector;
>> + else
>> + return sector >= reshape_sector;
>
> I like the ternary operator. ;-)
>
> return mddev->reshape_backwards ? (return sector < reshape_sector) :
> (sector >= reshape_sector)
>
> Sorry, does not matter.
Yeah, I think plenty of people do not, though; it's harder to read with
the long line and awkward to wrap.
> Reviewed-by: Paul Menzel <pmenzel@molgen.mpg.de>
Thanks,
Logan
next prev parent reply other threads:[~2022-04-21 16:05 UTC|newest]
Thread overview: 59+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-04-20 19:54 [PATCH v2 00/12] Improve Raid5 Lock Contention Logan Gunthorpe
2022-04-20 19:54 ` [PATCH v2 01/12] md/raid5: Factor out ahead_of_reshape() function Logan Gunthorpe
2022-04-21 6:07 ` Christoph Hellwig
2022-04-21 9:17 ` Paul Menzel
2022-04-21 16:05 ` Logan Gunthorpe [this message]
2022-04-21 23:33 ` Wol
2022-04-27 1:28 ` Guoqing Jiang
2022-04-27 16:07 ` Logan Gunthorpe
2022-04-28 1:49 ` Guoqing Jiang
2022-04-28 15:44 ` Logan Gunthorpe
2022-04-29 0:24 ` Guoqing Jiang
2022-04-20 19:54 ` [PATCH v2 02/12] md/raid5: Refactor raid5_make_request loop Logan Gunthorpe
2022-04-21 6:08 ` Christoph Hellwig
2022-04-27 1:32 ` Guoqing Jiang
2022-04-27 16:08 ` Logan Gunthorpe
2022-04-28 1:16 ` Guoqing Jiang
2022-04-20 19:54 ` [PATCH v2 03/12] md/raid5: Move stripe_add_to_batch_list() call out of add_stripe_bio() Logan Gunthorpe
2022-04-27 1:33 ` Guoqing Jiang
2022-04-20 19:54 ` [PATCH v2 04/12] md/raid5: Move common stripe count increment code into __find_stripe() Logan Gunthorpe
2022-04-21 6:10 ` Christoph Hellwig
2022-04-27 1:33 ` Guoqing Jiang
2022-04-20 19:54 ` [PATCH v2 05/12] md/raid5: Factor out helper from raid5_make_request() loop Logan Gunthorpe
2022-04-21 6:14 ` Christoph Hellwig
2022-04-20 19:54 ` [PATCH v2 06/12] md/raid5: Drop the do_prepare flag in raid5_make_request() Logan Gunthorpe
2022-04-21 6:15 ` Christoph Hellwig
2022-04-27 2:11 ` Guoqing Jiang
2022-04-20 19:54 ` [PATCH v2 07/12] md/raid5: Move read_seqcount_begin() into make_stripe_request() Logan Gunthorpe
2022-04-21 6:15 ` Christoph Hellwig
2022-04-27 2:13 ` Guoqing Jiang
2022-04-20 19:54 ` [PATCH v2 08/12] md/raid5: Refactor for loop in raid5_make_request() into while loop Logan Gunthorpe
2022-04-21 6:16 ` Christoph Hellwig
2022-04-20 19:54 ` [PATCH v2 09/12] md/raid5: Keep a reference to last stripe_head for batch Logan Gunthorpe
2022-04-21 6:17 ` Christoph Hellwig
2022-04-27 1:36 ` Guoqing Jiang
2022-04-27 23:27 ` Logan Gunthorpe
2022-04-20 19:54 ` [PATCH v2 10/12] md/raid5: Refactor add_stripe_bio() Logan Gunthorpe
2022-04-21 6:18 ` Christoph Hellwig
2022-04-20 19:54 ` [PATCH v2 11/12] md/raid5: Check all disks in a stripe_head for reshape progress Logan Gunthorpe
2022-04-21 6:18 ` Christoph Hellwig
2022-04-27 1:53 ` Guoqing Jiang
2022-04-27 16:11 ` Logan Gunthorpe
2022-04-20 19:54 ` [PATCH v2 12/12] md/raid5: Pivot raid5_make_request() Logan Gunthorpe
2022-04-21 6:43 ` Christoph Hellwig
2022-04-21 15:54 ` Logan Gunthorpe
2022-04-27 2:06 ` Guoqing Jiang
2022-04-27 16:18 ` Logan Gunthorpe
2022-04-28 1:32 ` Guoqing Jiang
2022-04-21 8:45 ` [PATCH v2 00/12] Improve Raid5 Lock Contention Xiao Ni
2022-04-21 16:02 ` Logan Gunthorpe
2022-04-24 8:00 ` Guoqing Jiang
2022-04-25 15:39 ` Logan Gunthorpe
2022-04-25 16:12 ` Xiao Ni
2022-04-28 21:22 ` Logan Gunthorpe
2022-04-29 0:49 ` Guoqing Jiang
2022-04-29 16:01 ` Logan Gunthorpe
2022-04-30 1:44 ` Guoqing Jiang
2022-04-24 7:53 ` Guoqing Jiang
2022-04-25 15:37 ` Logan Gunthorpe
2022-04-25 23:07 ` Song Liu
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