From: Grant Grundler <grundler@parisc-linux.org>
To: Randolph Chung <randolph@tausq.org>
Cc: parisc-linux@lists.parisc-linux.org
Subject: Re: [parisc-linux] 2.6.10-rc1-pa11 profile data
Date: Thu, 11 Nov 2004 11:36:05 -0700 [thread overview]
Message-ID: <20041111183605.GA19327@colo.lackof.org> (raw)
In-Reply-To: <20041111175933.GU15714@tausq.org>
On Thu, Nov 11, 2004 at 09:59:33AM -0800, Randolph Chung wrote:
> sure, we can zero all the call clobbered registers on exit. But not
> having to save all of those pesky floating pointer registers and half a
> dozen general registers should still be a huge win.
Randolph and I talked about this more privately.
In a nutshell, "huge win" is slightly overstating it and we agree
fixing the cache utilization would be a much bigger win.
Randolph thinks we can save 20 load and stores per interrupt
and potential context switches. The thinking is we are saving/restoring
some registers twice and should split the save/restore between
interrupt/trap and context switch code. So if no context switch is
performed, we only save/restore a subset of the registers manually
and the rest are preserved according to the ABI.
Did I get that right?
thanks,
grant
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next prev parent reply other threads:[~2004-11-11 18:36 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-11-11 7:54 [parisc-linux] 2.6.10-rc1-pa11 profile data Grant Grundler
2004-11-11 8:11 ` Randolph Chung
2004-11-11 17:39 ` Carlos O'Donell
2004-11-11 17:42 ` Randolph Chung
2004-11-11 17:50 ` Matthew Wilcox
2004-11-11 17:59 ` Randolph Chung
2004-11-11 18:36 ` Grant Grundler [this message]
2004-11-11 18:23 ` Joel Soete
2004-11-11 18:51 ` Randolph Chung
2004-11-26 16:59 ` flush_kernel_[di]cache_page question? [WAS: " Joel Soete
2004-11-26 17:13 ` Randolph Chung
2004-11-26 19:02 ` Grant Grundler
2004-11-28 21:01 ` [id]cache meaning? [Was: [parisc-linux] 2.6.10-rc1-pa11 profile data] Joel Soete
2004-11-28 21:13 ` Matthew Wilcox
2004-11-29 1:14 ` Michael S. Zick
2004-11-29 2:00 ` Matthew Wilcox
2004-12-01 17:44 ` More questions " Joel Soete
2004-12-01 17:56 ` Matthew Wilcox
2004-12-01 18:33 ` Joel Soete
2004-12-03 10:24 ` Joel Soete
2004-12-03 15:41 ` Randolph Chung
2004-12-07 14:42 ` Joel Soete
2004-12-03 15:00 ` *lcul and memory granularity question[Was: " Joel Soete
2004-12-03 15:13 ` Matthew Wilcox
2004-11-12 5:29 ` [parisc-linux] 2.6.10-rc1-pa11 profile data Grant Grundler
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