From: Ingo Molnar <mingo@elte.hu>
To: David Miller <davem@davemloft.net>
Cc: linux-kernel@vger.kernel.org, torvalds@linux-foundation.org,
akpm@linux-foundation.org, viro@ZenIV.linux.org.uk,
Alexander van Heukelum <heukelum@mailshack.com>
Subject: Re: find_new_bit bloat from x86 tree...
Date: Sun, 27 Apr 2008 22:41:29 +0200 [thread overview]
Message-ID: <20080427204129.GB25300@elte.hu> (raw)
In-Reply-To: <20080426.220726.13692428.davem@davemloft.net>
* David Miller <davem@davemloft.net> wrote:
> Ingo, what the heck is this?
>
> commit 64970b68d2b3ed32b964b0b30b1b98518fde388e
> Author: Alexander van Heukelum <heukelum@mailshack.com>
(Alexander Cc:-ed.)
> Date: Tue Mar 11 16:17:19 2008 +0100
>
> x86, generic: optimize find_next_(zero_)bit for small constant-size bitmaps
>
> Thanks for bloating up the inline expansion of this thing on every
> architecture that doesn't do __ffs() in a simple sequence of a few
> instructions like x86 does.
ok, that's bad. How much is the before/after vmlinux btw, i guess you
measured it? We could either make it per arch selectable, or we could
just uninline it all. It shouldnt be a big deal on x86 and it should
help on RISC platforms.
Ingo
next prev parent reply other threads:[~2008-04-27 20:41 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-04-27 5:07 David Miller
2008-04-27 20:41 ` Ingo Molnar [this message]
2008-04-28 11:41 ` Alexander van Heukelum
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