RE: [PATCH 00/13] kdump, vmcore: support mmap() on /proc/vmcore

2013-02-17 Thread Hatayama, Daisuke
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()

RE: [PATCH 00/13] kdump, vmcore: support mmap() on /proc/vmcore

2013-02-17 Thread Hatayama, Daisuke
From: Atsushi Kumagai kumagai-atsu...@mxc.nes.nec.co.jp 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 d.hatay...@jp.fujitsu.com wrote: cut TODO - fix makedumpfile

Re: [PATCH 00/13] kdump, vmcore: support mmap() on /proc/vmcore

2013-02-14 Thread Atsushi Kumagai
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

[PATCH 00/13] kdump, vmcore: support mmap() on /proc/vmcore

2013-02-14 Thread HATAYAMA Daisuke
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

[PATCH 00/13] kdump, vmcore: support mmap() on /proc/vmcore

2013-02-14 Thread HATAYAMA Daisuke
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

Re: [PATCH 00/13] kdump, vmcore: support mmap() on /proc/vmcore

2013-02-14 Thread Atsushi Kumagai
Hello HATAYAMA-san, On Thu, 14 Feb 2013 19:11:43 +0900 HATAYAMA Daisuke d.hatay...@jp.fujitsu.com 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,