linux-kernel - Re: [perfmon] Re: [perfmon2] perfmon2 merge news

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Message-Id: <20071119.165313.163834190.davem@davemloft.net>
Date:	Mon, 19 Nov 2007 16:53:13 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	eranian@....hp.com
Cc:	paulus@...ba.org, hch@...radead.org, akpm@...ux-foundation.org,
	gregkh@...e.de, mucci@...utk.edu, wcohen@...hat.com,
	robert.richter@....com, linux-kernel@...r.kernel.org,
	andi@...stfloor.org
Subject: Re: [perfmon] Re: [perfmon2] perfmon2 merge news

From: Stephane Eranian <eranian@....hp.com>
Date: Mon, 19 Nov 2007 14:48:46 -0800

> Looks like we will have to use bytes (u8) instead.  This may have some
> performance impact as well. Several bitmaps are used in the context/interrupt
> routines. Even with u8, there is still a problem with the bitmap*() macros.
> Now, only a small subset of the bitmap() macros are used, so it may be okay
> to duplicate them for u8.

I think it would be fine to just create a set of bitop interfaces that
operate on u32 objects instead of "unsigned long".

Currently perfmon2 does not need the atomic variants at all, and those
could thus be provided entirely under include/asm-generic/bitops/
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