linux-kernel - Re: [PATCH] vfs: does call expand

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Date:	Wed, 18 Nov 2009 17:37:44 +0800
From:	Liu Aleaxander <aleaxander@...il.com>
To:	Américo Wang <xiyou.wangcong@...il.com>
Cc:	Alexander Viro <viro@...iv.linux.org.uk>,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH] vfs: does call expand_files when needed

On Wed, Nov 18, 2009 at 5:22 PM, Américo Wang <xiyou.wangcong@...il.com> wrote:
> On Wed, Nov 18, 2009 at 4:54 PM, Liu Aleaxander <aleaxander@...il.com> wrote:
>
> <snip>
>
>>
>>>it's trivial, not so much an improvement, IMO.
>> So, shouldn't we do the optimize when there is a way to do that?
>>
>> While, I don't think so. And BTW, it's not just a problem of
>> optimization, but also make it be more sense: JUST call expand when
>> need. I don't know why you are rejecting about this, especially it did
>> optimized one call path(as you said), and it doesn't make the code
>> uglier than before but making it be more sense, and, in fact, a kind
>> of more readable.
>
>
> I am not rejecting it, I said this is trivial, so accepting it or droping
> it both are OK for me.
>
> I don't think the orignal code is ugly,
I didn't say the old code is ugly either. ;)

>'< fdt->max_fds' is not checked for expand_files(), but for find_next_zero_bit().
According to the old code, it's true, but it can also be applied to
expand_files checking. And just like what I said, we did rarely need
expand the file table as usual; even though we need, one-time expand
will be enough for a long while as it doubles the original size. (Am I
right?).



-- 
regards
Liu Aleaxander
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