Re: [PATCH 2/2 v2] kexec: Export PG_hwpoison flag into vmcoreinfo
From: Eric W. Biederman
Date: Tue Feb 12 2013 - 05:59:24 EST
Mitsuhiro Tanino <mitsuhiro.tanino.gm@xxxxxxxxxxx> writes:
> Re: [Patch 0/2] Exclude hwpoison page from vmcore dump
> (2012/11/01 19:40), Eric W. Biederman wrote:
>> Mitsuhiro Tanino <mitsuhiro.tanino.gm@xxxxxxxxxxx> writes:
>> I agree. If we are performing filtering filtering out of poisoned pages
>> seems very reasonable. So ack on the basic concept.
> Hello, Eric,
> Could you please push the patch to export PG_hwpoison flag into 3.9 during
> next merge window?
> Kumagai-san acked the patch which provides the feature to exclude hwpoison
> page and he will push the fix of makedumpfile side into makedumpfile-1.5.2.
> This kernel patch is also required to enable this feature.
If Andrew hasn't already picked this up please send send a copy of the
patch through him. Kexec related patches have historically gone through
Andrew after review.
Right now I don't have a kexec tree in linux-next and I don't have the
time/energy to start running one right now.
But I am happy to add my acked-by to the patch. Exporting PG_hwpoison
seems entirely reasonable.
I thought I read somewhere upthread that Andrew had already picked this
patch up though?
> Mitsuhiro Tanino
> (2013/02/08 17:49), Atsushi Kumagai wrote:
>> On Wed, 31 Oct 2012 23:05:05 +0900
>> Mitsuhiro Tanino <mitsuhiro.tanino.gm@xxxxxxxxxxx> wrote:
>>> This patch exports a PG_hwpoison into vmcoreinfo when
>>> CONFIG_MEMORY_FAILURE is defined.
>>> "makedumpfile" needs to read information of memory, such as
>>> 'mem_section', 'zone', 'pageflags' from vmcore.
>>> We introduce a function into "makedumpfile" to exclude
>>> hwpoison page from vmcore dump.
>>> In order to introduce this function, PG_hwpoison flag have
>>> to export into vmcoreinfo.
>>> Signed-off-by: Mitsuhiro Tanino <mitsuhiro.tanino.gm@xxxxxxxxxxx>
>> I'm curious to know the status of this patch because I'll release
>> makedumpfile-1.5.2 with the feature to exclude hwpoison page soon.
>> Atsushi Kumagai
Acked-by: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>
>>> kernel/kexec.c | 3 +++
>>> 1 file changed, 3 insertions(+)
>>> diff --git a/kernel/kexec.c b/kernel/kexec.c
>>> index 0668d58..0d5d6bc 100644
>>> --- a/kernel/kexec.c
>>> +++ b/kernel/kexec.c
>>> @@ -1513,6 +1513,9 @@ static int __init crash_save_vmcoreinfo_init(void)
>>> +#ifdef CONFIG_MEMORY_FAILURE
>>> + VMCOREINFO_NUMBER(PG_hwpoison);
>>> kexec mailing list
>> kexec mailing list
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