linux-kernel - Re: [PATCH v2 1/3] zsmalloc: support zsmalloc to ARM, MIPS, SUPERH

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Message-ID: <4FBD4DDF.5080905@linux.vnet.ibm.com>
Date:	Wed, 23 May 2012 15:51:43 -0500
From:	Seth Jennings <sjenning@...ux.vnet.ibm.com>
To:	Minchan Kim <minchan@...nel.org>
CC:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Nitin Gupta <ngupta@...are.org>,
	Dan Magenheimer <dan.magenheimer@...cle.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Russell King <linux@....linux.org.uk>,
	Ralf Baechle <ralf@...ux-mips.org>,
	Paul Mundt <lethal@...ux-sh.org>,
	Guan Xuetao <gxt@...c.pku.edu.cn>,
	Chen Liqin <liqin.chen@...plusct.com>
Subject: Re: [PATCH v2 1/3] zsmalloc: support zsmalloc to ARM, MIPS, SUPERH

On 05/15/2012 09:05 PM, Minchan Kim wrote:

> zsmalloc uses set_pte and __flush_tlb_one for performance but
> many architecture don't support it. so this patch removes
> set_pte and __flush_tlb_one which are x86 dependency.
> Instead of it, use local_flush_tlb_kernel_range which are available
> by more architectures. It would be better than supporting only x86
> and last patch in series will enable again with supporting
> local_flush_tlb_kernel_range in x86.
> 
> About local_flush_tlb_kernel_range,
> If architecture is very smart, it could flush only tlb entries related to vaddr.
> If architecture is smart, it could flush only tlb entries related to a CPU.
> If architecture is _NOT_ smart, it could flush all entries of all CPUs.
> So, it would be best to support both portability and performance.
> 
> Cc: Russell King <linux@....linux.org.uk>
> Cc: Ralf Baechle <ralf@...ux-mips.org>
> Cc: Paul Mundt <lethal@...ux-sh.org>
> Cc: Guan Xuetao <gxt@...c.pku.edu.cn>
> Cc: Chen Liqin <liqin.chen@...plusct.com>
> Signed-off-by: Minchan Kim <minchan@...nel.org>


For the zsmalloc changes:

Acked-by: Seth Jennings <sjenning@...ux.vnet.ibm.com>

Thanks,
Seth

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