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From: Alexey Dobriyan <adobriyan@gmail.com>
To: Andrei Vagin <avagin@virtuozzo.com>
Cc: Andrei Vagin <avagin@openvz.org>,
	linux-fsdevel@vger.kernel.org,
	Andrew Morton <akpm@linux-foundation.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Subject: Re: [PATCH v2] procfs: add seq_put_hex_ll to speed up /proc/pid/maps
Date: Tue, 13 Feb 2018 01:15:02 +0300	[thread overview]
Message-ID: <20180212221502.GA15398@avx2> (raw)
In-Reply-To: <20180210075000.GA386@outlook.office365.com>

On Fri, Feb 09, 2018 at 11:50:01PM -0800, Andrei Vagin wrote:
> On Fri, Feb 09, 2018 at 04:48:47PM +0300, Alexey Dobriyan wrote:
> > On Wed, Jan 17, 2018 at 12:20:50AM -0800, Andrei Vagin wrote:
> > > + * seq_put_hex_ll(m, "", v, 8) is equal to seq_printf(m, "0x08llx", v)
> > 
> > No, it is not. Scratch "0x".
> 
> will fix
> > 
> > > +void seq_put_hex_ll(struct seq_file *m, const char *delimiter,
> > > +				unsigned long long v, int width)
> > 
> > I understand that "unsigned long long" mimics decimal counterpart,
> > but in thie case everything is "unsigned long" including ->vm_pgoff.
> 
> I've checked that the performance is the same for "unsigned long long" and
> "unsigned long". Do we have other reasons to use "unsigned long" rather
> than "unsigned long long"?

On 32-bit those types are different.
But I guess as seq_put_decimal is ull, it is worse to deviate.

      reply	other threads:[~2018-02-12 22:15 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-01-12 18:58 [PATCH 1/2] " Andrei Vagin
2018-01-12 18:58 ` [PATCH 2/2] procfs: optimize seq_pad() " Andrei Vagin
2018-01-12 23:33 ` [PATCH 1/2] procfs: add seq_put_hex_ll " Andrew Morton
2018-01-15  7:04   ` Andrei Vagin
2018-01-17  8:20   ` [PATCH v2] " Andrei Vagin
2018-02-09 13:48     ` Alexey Dobriyan
2018-02-10  7:50       ` Andrei Vagin
2018-02-12 22:15         ` Alexey Dobriyan [this message]

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