From: "H. Peter Anvin" <hpa@zytor.com>
To: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: riel@redhat.com, hughd@google.com, kexec@lists.infradead.org,
linux-kernel@vger.kernel.org, lisa.mitchell@hp.com,
linux-mm@kvack.org, HATAYAMA Daisuke <d.hatayama@jp.fujitsu.com>,
kumagai-atsushi@mxc.nes.nec.co.jp, jingbai.ma@hp.com,
kosaki.motohiro@jp.fujitsu.com, zhangyanfei@cn.fujitsu.com,
akpm@linux-foundation.org, walken@google.com, cpw@sgi.com,
vgoyal@redhat.com
Subject: Re: [PATCH v6 0/8] kdump, vmcore: support mmap() on /proc/vmcore
Date: Thu, 16 May 2013 20:21:07 -0700 [thread overview]
Message-ID: <5195A223.2070204@zytor.com> (raw)
In-Reply-To: <87y5bee2qc.fsf@xmission.com>
On 05/16/2013 07:53 PM, Eric W. Biederman wrote:
>
> That is completely and totally orthogonal to this change.
>
> read_oldmem may have problems but in practice on a large systems those
> problems are totally dwarfed by real life performance issues that come
> from playing too much with the page tables.
>
> I really don't find bringing up whatever foundational issues you have
> with read_oldmem() appropriate or relevant here.
>
Well, it is in the sense that we have two pieces of code doing the same
thing, each with different bugs.
-hpa
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WARNING: multiple messages have this Message-ID (diff)
From: "H. Peter Anvin" <hpa@zytor.com>
To: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: HATAYAMA Daisuke <d.hatayama@jp.fujitsu.com>,
vgoyal@redhat.com, akpm@linux-foundation.org, cpw@sgi.com,
kumagai-atsushi@mxc.nes.nec.co.jp, lisa.mitchell@hp.com,
kexec@lists.infradead.org, linux-kernel@vger.kernel.org,
zhangyanfei@cn.fujitsu.com, jingbai.ma@hp.com,
linux-mm@kvack.org, riel@redhat.com, walken@google.com,
hughd@google.com, kosaki.motohiro@jp.fujitsu.com
Subject: Re: [PATCH v6 0/8] kdump, vmcore: support mmap() on /proc/vmcore
Date: Thu, 16 May 2013 20:21:07 -0700 [thread overview]
Message-ID: <5195A223.2070204@zytor.com> (raw)
In-Reply-To: <87y5bee2qc.fsf@xmission.com>
On 05/16/2013 07:53 PM, Eric W. Biederman wrote:
>
> That is completely and totally orthogonal to this change.
>
> read_oldmem may have problems but in practice on a large systems those
> problems are totally dwarfed by real life performance issues that come
> from playing too much with the page tables.
>
> I really don't find bringing up whatever foundational issues you have
> with read_oldmem() appropriate or relevant here.
>
Well, it is in the sense that we have two pieces of code doing the same
thing, each with different bugs.
-hpa
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WARNING: multiple messages have this Message-ID (diff)
From: "H. Peter Anvin" <hpa@zytor.com>
To: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: HATAYAMA Daisuke <d.hatayama@jp.fujitsu.com>,
vgoyal@redhat.com, akpm@linux-foundation.org, cpw@sgi.com,
kumagai-atsushi@mxc.nes.nec.co.jp, lisa.mitchell@hp.com,
kexec@lists.infradead.org, linux-kernel@vger.kernel.org,
zhangyanfei@cn.fujitsu.com, jingbai.ma@hp.com,
linux-mm@kvack.org, riel@redhat.com, walken@google.com,
hughd@google.com, kosaki.motohiro@jp.fujitsu.com
Subject: Re: [PATCH v6 0/8] kdump, vmcore: support mmap() on /proc/vmcore
Date: Thu, 16 May 2013 20:21:07 -0700 [thread overview]
Message-ID: <5195A223.2070204@zytor.com> (raw)
In-Reply-To: <87y5bee2qc.fsf@xmission.com>
On 05/16/2013 07:53 PM, Eric W. Biederman wrote:
>
> That is completely and totally orthogonal to this change.
>
> read_oldmem may have problems but in practice on a large systems those
> problems are totally dwarfed by real life performance issues that come
> from playing too much with the page tables.
>
> I really don't find bringing up whatever foundational issues you have
> with read_oldmem() appropriate or relevant here.
>
Well, it is in the sense that we have two pieces of code doing the same
thing, each with different bugs.
-hpa
next prev parent reply other threads:[~2013-05-17 3:22 UTC|newest]
Thread overview: 84+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-05-15 9:05 [PATCH v6 0/8] kdump, vmcore: support mmap() on /proc/vmcore HATAYAMA Daisuke
2013-05-15 9:05 ` HATAYAMA Daisuke
2013-05-15 9:05 ` HATAYAMA Daisuke
2013-05-15 9:05 ` [PATCH v6 1/8] vmcore: clean up read_vmcore() HATAYAMA Daisuke
2013-05-15 9:05 ` HATAYAMA Daisuke
2013-05-15 9:05 ` HATAYAMA Daisuke
2013-05-15 9:33 ` Zhang Yanfei
2013-05-15 9:33 ` Zhang Yanfei
2013-05-15 9:33 ` Zhang Yanfei
2013-05-15 9:05 ` [PATCH v6 2/8] vmcore: allocate buffer for ELF headers on page-size alignment HATAYAMA Daisuke
2013-05-15 9:05 ` HATAYAMA Daisuke
2013-05-15 9:05 ` HATAYAMA Daisuke
2013-05-16 5:58 ` Zhang Yanfei
2013-05-16 5:58 ` Zhang Yanfei
2013-05-16 5:58 ` Zhang Yanfei
2013-05-16 16:51 ` Vivek Goyal
2013-05-16 16:51 ` Vivek Goyal
2013-05-16 16:51 ` Vivek Goyal
2013-05-17 0:08 ` HATAYAMA Daisuke
2013-05-17 0:08 ` HATAYAMA Daisuke
2013-05-17 0:08 ` HATAYAMA Daisuke
2013-05-15 9:05 ` [PATCH v6 3/8] vmcore: treat memory chunks referenced by PT_LOAD program header entries in page-size boundary in vmcore_list HATAYAMA Daisuke
2013-05-15 9:05 ` HATAYAMA Daisuke
2013-05-15 9:05 ` HATAYAMA Daisuke
2013-05-16 5:59 ` Zhang Yanfei
2013-05-16 5:59 ` Zhang Yanfei
2013-05-16 5:59 ` Zhang Yanfei
2013-05-15 9:06 ` [PATCH v6 4/8] vmalloc: make find_vm_area check in range HATAYAMA Daisuke
2013-05-15 9:06 ` HATAYAMA Daisuke
2013-05-15 9:06 ` HATAYAMA Daisuke
2013-05-15 21:37 ` KOSAKI Motohiro
2013-05-15 21:37 ` KOSAKI Motohiro
2013-05-15 21:37 ` KOSAKI Motohiro
2013-05-16 23:45 ` HATAYAMA Daisuke
2013-05-16 23:45 ` HATAYAMA Daisuke
2013-05-16 23:45 ` HATAYAMA Daisuke
2013-05-15 9:06 ` [PATCH v6 5/8] vmalloc: introduce remap_vmalloc_range_partial HATAYAMA Daisuke
2013-05-15 9:06 ` HATAYAMA Daisuke
2013-05-15 9:06 ` HATAYAMA Daisuke
2013-05-15 9:06 ` [PATCH v6 6/8] vmcore: allocate ELF note segment in the 2nd kernel vmalloc memory HATAYAMA Daisuke
2013-05-15 9:06 ` HATAYAMA Daisuke
2013-05-15 9:06 ` HATAYAMA Daisuke
2013-05-16 7:19 ` Zhang Yanfei
2013-05-16 7:19 ` Zhang Yanfei
2013-05-16 7:19 ` Zhang Yanfei
2013-05-16 20:32 ` Vivek Goyal
2013-05-16 20:32 ` Vivek Goyal
2013-05-16 20:32 ` Vivek Goyal
2013-05-16 23:47 ` HATAYAMA Daisuke
2013-05-16 23:47 ` HATAYAMA Daisuke
2013-05-16 23:47 ` HATAYAMA Daisuke
2013-05-15 9:06 ` [PATCH v6 7/8] vmcore: calculate vmcore file size from buffer size and total size of vmcore objects HATAYAMA Daisuke
2013-05-15 9:06 ` HATAYAMA Daisuke
2013-05-15 9:06 ` HATAYAMA Daisuke
2013-05-16 7:19 ` Zhang Yanfei
2013-05-16 7:19 ` Zhang Yanfei
2013-05-16 7:19 ` Zhang Yanfei
2013-05-15 9:06 ` [PATCH v6 8/8] vmcore: support mmap() on /proc/vmcore HATAYAMA Daisuke
2013-05-15 9:06 ` HATAYAMA Daisuke
2013-05-15 9:06 ` HATAYAMA Daisuke
2013-05-16 7:25 ` Zhang Yanfei
2013-05-16 7:25 ` Zhang Yanfei
2013-05-16 7:25 ` Zhang Yanfei
2013-05-16 20:44 ` Vivek Goyal
2013-05-16 20:44 ` Vivek Goyal
2013-05-16 20:44 ` Vivek Goyal
2013-05-17 0:06 ` [PATCH v6 0/8] kdump, " H. Peter Anvin
2013-05-17 0:06 ` H. Peter Anvin
2013-05-17 0:06 ` H. Peter Anvin
2013-05-17 1:45 ` HATAYAMA Daisuke
2013-05-17 1:45 ` HATAYAMA Daisuke
2013-05-17 1:45 ` HATAYAMA Daisuke
2013-05-17 2:53 ` Eric W. Biederman
2013-05-17 2:53 ` Eric W. Biederman
2013-05-17 2:53 ` Eric W. Biederman
2013-05-17 3:21 ` H. Peter Anvin [this message]
2013-05-17 3:21 ` H. Peter Anvin
2013-05-17 3:21 ` H. Peter Anvin
2013-05-17 4:29 ` Eric W. Biederman
2013-05-17 4:29 ` Eric W. Biederman
2013-05-17 4:29 ` Eric W. Biederman
2013-05-17 5:43 ` H. Peter Anvin
2013-05-17 5:43 ` H. Peter Anvin
2013-05-17 5:43 ` H. Peter Anvin
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