From: Jens Axboe <axboe@fb.com>
To: Jan Kara <jack@suse.cz>
Cc: <linux-fsdevel@vger.kernel.org>, <elliott@hp.com>
Subject: Re: [PATCH] bio: skip atomic inc/dec of ->bi_remaining for non-chains
Date: Mon, 20 Apr 2015 10:42:13 -0600 [thread overview]
Message-ID: <55352C65.4070805@fb.com> (raw)
In-Reply-To: <20150420160446.GL17020@quack.suse.cz>
On 04/20/2015 10:04 AM, Jan Kara wrote:
> On Fri 17-04-15 08:59:33, Jens Axboe wrote:
>> @@ -292,8 +292,8 @@ void bio_reset(struct bio *bio)
>> __bio_free(bio);
>>
>> memset(bio, 0, BIO_RESET_BYTES);
>> - bio->bi_flags = flags|(1 << BIO_UPTODATE);
>> - atomic_set(&bio->bi_remaining, 1);
>> + bio->bi_flags = flags | 1 << BIO_UPTODATE;
> Although this is correct, I'd prefer to keep parenthesis around 1 <<
> BIO_UPTODATE. Maybe I'm not a real C hacker but I had to lookup the
> operator precedence of | vs << :).
Heh, I think we can safely say you are a real C hacker, lets just keep
the parenthesis if that makes it easier to read/verify.
> Otherwise the patch looks good to me (but I'm not an expert in this area, I
> just looked into the patch by accident because I thought it's another
> respin of your direct IO patch ;).
It's a parallel effort, getting rid of the atomics where we can...
Thanks for looking at it, can I add your reviewed-by tag with the
parenthesis change?
--
Jens Axboe
next prev parent reply other threads:[~2015-04-20 16:42 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-04-17 14:59 [PATCH] bio: skip atomic inc/dec of ->bi_remaining for non-chains Jens Axboe
2015-04-20 16:04 ` Jan Kara
2015-04-20 16:42 ` Jens Axboe [this message]
2015-04-21 9:04 ` Jan Kara
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