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From: Dan Carpenter <dan.carpenter@oracle.com>
To: Chao Yu <yuchao0@huawei.com>
Cc: devel@driverdev.osuosl.org,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Miao Xie <miaoxie@huawei.com>,
	LKML <linux-kernel@vger.kernel.org>,
	Christoph Hellwig <hch@infradead.org>,
	weidu.du@huawei.com, Joe Perches <joe@perches.com>,
	linux-erofs@lists.ozlabs.org
Subject: Re: [PATCH v3 6/7] erofs: remove all likely/unlikely annotations
Date: Fri, 30 Aug 2019 14:55:09 +0300
Message-ID: <20190830115509.GN23584@kadam> (raw)
In-Reply-To: <4f2d6464-39f0-4134-f7ba-eec3b09b22d8@huawei.com>

On Fri, Aug 30, 2019 at 02:25:13PM +0800, Chao Yu wrote:
> On 2019/8/30 11:36, Gao Xiang wrote:
> > As Dan Carpenter suggested [1], I have to remove
> > all erofs likely/unlikely annotations.
> > 
> > [1] https://lore.kernel.org/linux-fsdevel/20190829154346.GK23584@kadam/
> > Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
> > Signed-off-by: Gao Xiang <gaoxiang25@huawei.com>
> 
> I suggest we can modify this by following good example rather than removing them
> all, at least, the fuzzed random fields of disk layout handling should be very
> rare case, I guess it's fine to use unlikely.

No, no...  It's the opposite.  Only use those annotations on fast paths
where it's going to show up in benchmarks.  On fast paths then remove
all the debug code and really optimize the heck out of the code.  We
sacrifice readability for speed in places where it matters.

regards,
dan carpenter


  parent reply index

Thread overview: 38+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-30  3:00 [PATCH v2 1/7] erofs: on-disk format should have explicitly assigned numbers Gao Xiang
2019-08-30  3:00 ` [PATCH v2 2/7] erofs: some marcos are much more readable as a function Gao Xiang
2019-08-30  3:16   ` Joe Perches
2019-08-30  3:20     ` Gao Xiang
2019-08-30  3:36       ` [PATCH v3 1/7] erofs: on-disk format should have explicitly assigned numbers Gao Xiang
2019-08-30  3:36         ` [PATCH v3 2/7] erofs: some macros are much more readable as a function Gao Xiang
2019-08-30  3:38           ` [PATCH v4 " Gao Xiang
2019-08-30  6:11           ` [PATCH v3 " Chao Yu
2019-08-30  3:36         ` [PATCH v3 3/7] erofs: use a better form for complicated on-disk fields Gao Xiang
2019-08-30  3:36         ` [PATCH v3 4/7] erofs: kill __packed for on-disk structures Gao Xiang
2019-08-30  6:16           ` Chao Yu
2019-08-30  3:36         ` [PATCH v3 5/7] erofs: kill erofs_{init,exit}_inode_cache Gao Xiang
2019-08-30  6:17           ` Chao Yu
2019-08-30  3:36         ` [PATCH v3 6/7] erofs: remove all likely/unlikely annotations Gao Xiang
2019-08-30  6:25           ` Chao Yu
2019-08-30  6:31             ` Gao Xiang
2019-08-30  6:43               ` Chao Yu
2019-08-30 11:55             ` Dan Carpenter [this message]
2019-08-30 11:30           ` Dan Carpenter
2019-08-30 12:06             ` Gao Xiang via Linux-erofs
2019-08-30 15:46           ` Christoph Hellwig
2019-08-30 16:04             ` Gao Xiang
2019-08-31 10:57               ` Dan Carpenter
2019-08-30  3:36         ` [PATCH v3 7/7] erofs: redundant assignment in __erofs_get_meta_page() Gao Xiang
2019-08-30  6:25           ` Chao Yu
2019-08-30 16:28           ` Christoph Hellwig
2019-08-30 16:48             ` Gao Xiang
2019-08-30 15:25         ` [PATCH v3 1/7] erofs: on-disk format should have explicitly assigned numbers Gao Xiang
2019-08-30 15:45     ` [PATCH v2 2/7] erofs: some marcos are much more readable as a function Christoph Hellwig
2019-08-30 15:52       ` Gao Xiang
2019-08-30 15:56         ` Gao Xiang
2019-08-30  3:00 ` [PATCH v2 3/7] erofs: use a better form for complicated on-disk fields Gao Xiang
2019-08-30  3:29   ` Chao Yu
2019-08-30  3:00 ` [PATCH v2 4/7] erofs: kill __packed for on-disk structures Gao Xiang
2019-08-30  3:00 ` [PATCH v2 5/7] erofs: kill erofs_{init,exit}_inode_cache Gao Xiang
2019-08-30  3:00 ` [PATCH v2 6/7] erofs: remove all likely/unlikely annotations Gao Xiang
2019-08-30  3:00 ` [PATCH v2 7/7] erofs: reduntant assignment in __erofs_get_meta_page() Gao Xiang
2019-08-30  3:28 ` [PATCH v2 1/7] erofs: on-disk format should have explicitly assigned numbers Chao Yu

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