From: Atsushi Kumagai
Subject: Re: [PATCH 00/13] kdump, vmcore: support mmap() on /proc/vmcore
Date: Fri, 15 Feb 2013 12:57:01 +0900
> On Thu, 14 Feb 2013 19:11:43 +0900
> HATAYAMA Daisuke wrote:
>> TODO
>>
>>
>> - fix makedumpfile to use mmap() on /p
Hello HATAYAMA-san,
On Thu, 14 Feb 2013 19:11:43 +0900
HATAYAMA Daisuke wrote:
> Currently, read to /proc/vmcore is done by read_oldmem() that uses
> ioremap/iounmap per a single page. For example, if memory is 1GB,
> ioremap/iounmap is called (1GB / 4KB)-times, that is, 262144
> times. This cau
Currently, read to /proc/vmcore is done by read_oldmem() that uses
ioremap/iounmap per a single page. For example, if memory is 1GB,
ioremap/iounmap is called (1GB / 4KB)-times, that is, 262144
times. This causes big performance degradation.
To address the issue, this patch implements mmap() on /p
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