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From: Tejun Heo <tj@kernel.org>
To: Ingo Molnar <mingo@elte.hu>
Cc: rusty@rustcorp.com.au, tglx@linutronix.de, x86@kernel.org,
	linux-kernel@vger.kernel.org, hpa@zytor.com, jeremy@goop.org,
	cpw@sgi.com, nickpiggin@yahoo.com.au, ink@jurassic.park.msu.ru
Subject: Re: [PATCHSET x86/core/percpu] improve the first percpu chunk	allocation
Date: Tue, 24 Feb 2009 23:47:23 +0900	[thread overview]
Message-ID: <49A4087B.8080405@kernel.org> (raw)
In-Reply-To: <20090224125132.GB31295@elte.hu>

Hi,

Ingo Molnar wrote:
--snip--
> So what i'm saying is that these are strong reasons for us to 
> want to make the unit size to be something like 2MB - on 64-bit 
> x86 at least.
>
> ( Using a 2MB unit size will also have another advantage: _iff_ 
>   we can still allocate a hugepage at that point we can map it 
>   straight there when extending the dynamic area. )

Thanks for the explanation.  Yeap, it would be nice to have units
aligned on 2MB boundary.  We'll need to add @align to vm area alloc
function to do it correctly.  As for using large page, it would be
nice if we can do that automatically.  Upfront 2MB unit allocation is
probably too expensive but merging 4k pages into a large page (if we
can get them) will add a lot of irregular latency too.  Hmmm...

-- 
tejun

  reply	other threads:[~2009-02-24 14:48 UTC|newest]

Thread overview: 45+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-02-24  3:11 [PATCHSET x86/core/percpu] improve the first percpu chunk allocation Tejun Heo
2009-02-24  3:11 ` [PATCH 01/10] percpu: fix pcpu_chunk_struct_size Tejun Heo
2009-02-24  3:11 ` [PATCH 02/10] bootmem: clean up arch-specific bootmem wrapping Tejun Heo
2009-02-24 11:30   ` Johannes Weiner
2009-02-24 11:39     ` Tejun Heo
2009-02-24  3:11 ` [PATCH 03/10] bootmem: reorder interface functions and add a missing one Tejun Heo
2009-02-24  3:11 ` [PATCH 04/10] vmalloc: add @align to vm_area_register_early() Tejun Heo
2009-02-24  3:11 ` [PATCH 05/10] x86: update populate_extra_pte() and add populate_extra_pmd() Tejun Heo
2009-02-24  3:11 ` [PATCH 06/10] percpu: remove unit_size power-of-2 restriction Tejun Heo
2009-02-24  3:11 ` [PATCH 07/10] percpu: give more latitude to arch specific first chunk initialization Tejun Heo
2009-02-24  3:11 ` [PATCH 08/10] x86: separate out setup_pcpu_4k() from setup_per_cpu_areas() Tejun Heo
2009-02-24  3:11 ` [PATCH 09/10] x86: add embedding percpu first chunk allocator Tejun Heo
2009-02-24  3:11 ` [PATCH 10/10] x86: add remapping " Tejun Heo
2009-02-24  9:57 ` [PATCHSET x86/core/percpu] improve the first percpu chunk allocation Ingo Molnar
2009-02-24 11:48   ` Tejun Heo
2009-02-24 12:40     ` Ingo Molnar
2009-02-24 13:27       ` Tejun Heo
2009-02-24 14:12         ` Ingo Molnar
2009-02-24 14:37           ` Tejun Heo
2009-02-24 15:15             ` Ingo Molnar
2009-02-24 23:33               ` Tejun Heo
2009-03-04  0:03             ` Rusty Russell
2009-03-04  0:15               ` H. Peter Anvin
2009-03-04  0:50                 ` Ingo Molnar
2009-02-24 12:51     ` Ingo Molnar
2009-02-24 14:47       ` Tejun Heo [this message]
2009-02-24 15:19         ` Ingo Molnar
2009-02-24 15:30           ` Nick Piggin
2009-02-24 13:02     ` Ingo Molnar
2009-02-24 14:40       ` Tejun Heo
2009-02-24 20:17 ` Ingo Molnar
2009-02-24 20:51   ` Ingo Molnar
2009-02-24 21:02     ` Yinghai Lu
2009-02-24 21:12     ` [PATCH] x86: check range in reserve_early() -v2 Yinghai Lu
2009-02-24 21:16     ` [PATCHSET x86/core/percpu] improve the first percpu chunk allocation Ingo Molnar
2009-02-25  2:09       ` [PATCH x86/core/percpu 1/2] x86, percpu: fix minor bugs in setup_percpu.c Tejun Heo
2009-02-25  2:10       ` [PATCH x86/core/percpu 2/2] x86: convert cacheflush macros inline functions Tejun Heo
2009-02-25  2:23       ` [PATCHSET x86/core/percpu] improve the first percpu chunk allocation Tejun Heo
2009-02-25  2:56         ` Tejun Heo
2009-02-25 12:59         ` Ingo Molnar
2009-02-25 13:43           ` WARNING: at include/linux/percpu.h:159 __create_workqueue_key+0x1f6/0x220() Ingo Molnar
2009-02-26  2:03             ` [PATCH core/percpu] percpu: fix too low alignment restriction on UP Tejun Heo
2009-02-26  3:26               ` Ingo Molnar
2009-02-25  6:40       ` [PATCHSET x86/core/percpu] improve the first percpu chunk allocation Rusty Russell
2009-02-25 12:54         ` Ingo Molnar

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