From: Peter Chubb <peterc@gelato.unsw.edu.au> To: "Luck, Tony" <tony.luck@intel.com> Cc: Christoph Lameter <cl@linux-foundation.org>, Tejun Heo <teheo@suse.de>, Nick Piggin <npiggin@suse.de>, "Yu, Fenghua" <fenghua.yu@intel.com>, linux-ia64 <linux-ia64@vger.kernel.org>, Ingo Molnar <mingo@redhat.com>, Rusty Russell <rusty@rustcorp.com.au>, "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org> Subject: Re: [PATCHSET percpu#for-next] percpu: convert ia64 to dynamic percpu and drop the old one, take#2 Date: Thu, 01 Oct 2009 09:06:33 +1000 [thread overview] Message-ID: <87hbukxcau.wl%peter@chubb.wattle.id.au> (raw) In-Reply-To: <57C9024A16AD2D4C97DC78E552063EA3E2F03FDC@orsmsx505.amr.corp.intel.com> >>>>> "Tony" == Tony Luck <Luck> writes: >> Tony: Could we use a global register for the per cpu address? That >> would make IA64 work similar to sparc. Tony> Would that be a useful trade of resources for convenience? Tony> We've already hard-wired r13 for "current". Grabbing another one Tony> would require fixing (since user code will have clobbered it). Tony> Possibly re-working any existing code that already uses whatever Tony> register you choose. r3, r4 and r5 are currently unused by the kernel, and unused by GCC and ICC. Only hand-written assembler and weird compilers use those registers(and my virtual-machine monitor :-(). If you wanted to experiment, that'd be a starting place. I'm not sure of the advantage though -- TLB mapping is relatively cheap, and we're no longer hard-wiring the translation register. You';d have to do somne careful benchmarking on a wide variety of workloads and machines to get a definitive answer. --- Dr Peter Chubb www.nicta.com.au peter DOT chubb AT nicta.com.au http://www.ertos.nicta.com.au ERTOS within National ICT Australia >From Imagination to Impact Imagining the (ICT) Future
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From: Peter Chubb <peterc@gelato.unsw.edu.au> To: "Luck, Tony" <tony.luck@intel.com> Cc: Christoph Lameter <cl@linux-foundation.org>, Tejun Heo <teheo@suse.de>, Nick Piggin <npiggin@suse.de>, "Yu, Fenghua" <fenghua.yu@intel.com>, linux-ia64 <linux-ia64@vger.kernel.org>, Ingo Molnar <mingo@redhat.com>, Rusty Russell <rusty@rustcorp.com.au>, "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org> Subject: Re: [PATCHSET percpu#for-next] percpu: convert ia64 to dynamic percpu and drop the old one, take#2 Date: Wed, 30 Sep 2009 23:06:33 +0000 [thread overview] Message-ID: <87hbukxcau.wl%peter@chubb.wattle.id.au> (raw) In-Reply-To: <57C9024A16AD2D4C97DC78E552063EA3E2F03FDC@orsmsx505.amr.corp.intel.com> >>>>> "Tony" = Tony Luck <Luck> writes: >> Tony: Could we use a global register for the per cpu address? That >> would make IA64 work similar to sparc. Tony> Would that be a useful trade of resources for convenience? Tony> We've already hard-wired r13 for "current". Grabbing another one Tony> would require fixing (since user code will have clobbered it). Tony> Possibly re-working any existing code that already uses whatever Tony> register you choose. r3, r4 and r5 are currently unused by the kernel, and unused by GCC and ICC. Only hand-written assembler and weird compilers use those registers(and my virtual-machine monitor :-(). If you wanted to experiment, that'd be a starting place. I'm not sure of the advantage though -- TLB mapping is relatively cheap, and we're no longer hard-wiring the translation register. You';d have to do somne careful benchmarking on a wide variety of workloads and machines to get a definitive answer. --- Dr Peter Chubb www.nicta.com.au peter DOT chubb AT nicta.com.au http://www.ertos.nicta.com.au ERTOS within National ICT Australia From Imagination to Impact Imagining the (ICT) Future
next prev parent reply other threads:[~2009-09-30 23:41 UTC|newest] Thread overview: 72+ messages / expand[flat|nested] mbox.gz Atom feed top 2009-09-23 5:06 [PATCHSET percpu#for-next] percpu: convert ia64 to dynamic percpu and drop the old one, take#2 Tejun Heo 2009-09-23 5:06 ` Tejun Heo 2009-09-23 5:06 ` [PATCH 1/5] ia64: don't alias VMALLOC_END to vmalloc_end Tejun Heo 2009-09-23 5:06 ` Tejun Heo 2009-09-23 5:06 ` [PATCH 2/5] ia64: initialize cpu maps early Tejun Heo 2009-09-23 5:06 ` Tejun Heo 2009-09-23 5:06 ` [PATCH 3/5] ia64: allocate percpu area for cpu0 like percpu areas for other cpus Tejun Heo 2009-09-23 5:06 ` Tejun Heo 2009-09-23 5:06 ` [PATCH 4/5] ia64: convert to dynamic percpu allocator Tejun Heo 2009-09-23 5:06 ` Tejun Heo 2009-09-23 5:06 ` [PATCH 5/5] percpu: kill legacy " Tejun Heo 2009-09-23 5:06 ` Tejun Heo 2009-09-23 11:10 ` Rusty Russell 2009-09-23 11:22 ` Rusty Russell 2009-09-29 0:25 ` [PATCHSET percpu#for-next] percpu: convert ia64 to dynamic percpu and drop the old one, take#2 Tejun Heo 2009-09-29 0:25 ` [PATCHSET percpu#for-next] percpu: convert ia64 to dynamic percpu Tejun Heo 2009-09-30 20:32 ` [PATCHSET percpu#for-next] percpu: convert ia64 to dynamic percpu and drop the old one, take#2 Luck, Tony 2009-09-30 20:32 ` [PATCHSET percpu#for-next] percpu: convert ia64 to dynamic Luck, Tony 2009-09-30 20:47 ` [PATCHSET percpu#for-next] percpu: convert ia64 to dynamic percpu and drop the old one, take#2 Christoph Lameter 2009-09-30 20:47 ` [PATCHSET percpu#for-next] percpu: convert ia64 to dynamic percpu Christoph Lameter 2009-09-30 22:05 ` [PATCHSET percpu#for-next] percpu: convert ia64 to dynamic percpu and drop the old one, take#2 Luck, Tony 2009-09-30 22:05 ` [PATCHSET percpu#for-next] percpu: convert ia64 to dynamic Luck, Tony 2009-09-30 23:06 ` Peter Chubb [this message] 2009-09-30 23:06 ` [PATCHSET percpu#for-next] percpu: convert ia64 to dynamic percpu and drop the old one, take#2 Peter Chubb 2009-09-30 23:49 ` Christoph Lameter 2009-09-30 23:49 ` [PATCHSET percpu#for-next] percpu: convert ia64 to dynamic percpu Christoph Lameter 2009-09-30 1:24 ` [PATCH REPOST 3/5] ia64: allocate percpu area for cpu0 like percpu areas for other cpus Tejun Heo 2009-09-30 1:24 ` [PATCH REPOST 3/5] ia64: allocate percpu area for cpu0 like percpu Tejun Heo 2009-10-02 5:11 ` [PATCHSET percpu#for-next] percpu: convert ia64 to dynamic percpu and drop the old one, take#2 Tejun Heo 2009-10-02 5:11 ` [PATCHSET percpu#for-next] percpu: convert ia64 to dynamic percpu Tejun Heo -- strict thread matches above, loose matches on Subject: below -- 2009-09-22 7:40 [PATCHSET percpu#for-next] percpu: convert ia64 to dynamic percpu and drop the old one Tejun Heo 2009-09-22 7:40 ` Tejun Heo 2009-09-22 7:40 ` [PATCH 1/4] vmalloc: rename local variables vmalloc_start and vmalloc_end Tejun Heo 2009-09-22 7:40 ` Tejun Heo 2009-09-22 22:52 ` Christoph Lameter 2009-09-22 22:52 ` [PATCH 1/4] vmalloc: rename local variables vmalloc_start and Christoph Lameter 2009-09-23 2:08 ` [PATCH 1/4] vmalloc: rename local variables vmalloc_start and vmalloc_end Tejun Heo 2009-09-23 2:08 ` [PATCH 1/4] vmalloc: rename local variables vmalloc_start and Tejun Heo 2009-09-22 7:40 ` [PATCH 2/4] ia64: allocate percpu area for cpu0 like percpu areas for other cpus Tejun Heo 2009-09-22 7:40 ` Tejun Heo 2009-09-22 22:59 ` Christoph Lameter 2009-09-22 22:59 ` [PATCH 2/4] ia64: allocate percpu area for cpu0 like percpu Christoph Lameter 2009-09-23 2:11 ` [PATCH 2/4] ia64: allocate percpu area for cpu0 like percpu areas for other cpus Tejun Heo 2009-09-23 2:11 ` [PATCH 2/4] ia64: allocate percpu area for cpu0 like percpu areas Tejun Heo 2009-09-23 13:44 ` [PATCH 2/4] ia64: allocate percpu area for cpu0 like percpu areas for other cpus Christoph Lameter 2009-09-23 13:44 ` [PATCH 2/4] ia64: allocate percpu area for cpu0 like percpu Christoph Lameter 2009-09-23 14:01 ` [PATCH 2/4] ia64: allocate percpu area for cpu0 like percpu areas for other cpus Tejun Heo 2009-09-23 14:01 ` [PATCH 2/4] ia64: allocate percpu area for cpu0 like percpu areas Tejun Heo 2009-09-23 17:17 ` [PATCH 2/4] ia64: allocate percpu area for cpu0 like percpu areas for other cpus Christoph Lameter 2009-09-23 17:17 ` [PATCH 2/4] ia64: allocate percpu area for cpu0 like percpu Christoph Lameter 2009-09-23 22:03 ` [PATCH 2/4] ia64: allocate percpu area for cpu0 like percpu areas for other cpus Tejun Heo 2009-09-23 22:03 ` [PATCH 2/4] ia64: allocate percpu area for cpu0 like percpu areas Tejun Heo 2009-09-24 7:36 ` [PATCH 2/4] ia64: allocate percpu area for cpu0 like percpu areas for other cpus Christoph Lameter 2009-09-24 7:36 ` [PATCH 2/4] ia64: allocate percpu area for cpu0 like percpu Christoph Lameter 2009-09-24 8:37 ` [PATCH 2/4] ia64: allocate percpu area for cpu0 like percpu areas for other cpus Tejun Heo 2009-09-24 8:37 ` [PATCH 2/4] ia64: allocate percpu area for cpu0 like percpu areas Tejun Heo 2009-09-28 15:12 ` [PATCH 2/4] ia64: allocate percpu area for cpu0 like percpu areas for other cpus Christoph Lameter 2009-09-28 15:12 ` [PATCH 2/4] ia64: allocate percpu area for cpu0 like percpu Christoph Lameter 2009-09-22 7:40 ` [PATCH 3/4] ia64: convert to dynamic percpu allocator Tejun Heo 2009-09-22 7:40 ` Tejun Heo 2009-09-22 7:40 ` [PATCH 4/4] percpu: kill legacy " Tejun Heo 2009-09-22 7:40 ` Tejun Heo 2009-09-22 8:16 ` [PATCHSET percpu#for-next] percpu: convert ia64 to dynamic percpu and drop the old one Ingo Molnar 2009-09-22 8:16 ` [PATCHSET percpu#for-next] percpu: convert ia64 to dynamic Ingo Molnar 2009-09-22 20:49 ` [PATCHSET percpu#for-next] percpu: convert ia64 to dynamic percpu and drop the old one Luck, Tony 2009-09-22 20:49 ` [PATCHSET percpu#for-next] percpu: convert ia64 to dynamic Luck, Tony 2009-09-22 21:10 ` [PATCHSET percpu#for-next] percpu: convert ia64 to dynamic percpu and drop the old one Luck, Tony 2009-09-22 21:10 ` [PATCHSET percpu#for-next] percpu: convert ia64 to dynamic Luck, Tony 2009-09-22 21:24 ` [PATCHSET percpu#for-next] percpu: convert ia64 to dynamic percpu and drop the old one Luck, Tony 2009-09-22 21:24 ` [PATCHSET percpu#for-next] percpu: convert ia64 to dynamic Luck, Tony 2009-09-22 21:50 ` [PATCHSET percpu#for-next] percpu: convert ia64 to dynamic percpu and drop the old one Tejun Heo 2009-09-22 21:50 ` [PATCHSET percpu#for-next] percpu: convert ia64 to dynamic percpu Tejun Heo
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