Re: [PATCH 1/2] kdump: Allow shrinking of kdump region to beoverridden

From: WANG Cong
Date: Sun Mar 20 2011 - 23:10:56 EST

On Tue, 15 Mar 2011 22:22:19 +0530, Mahesh J Salgaonkar wrote:

> On Tue, Mar 15, 2011 at 03:52:38PM +0800, AmÃrico Wang wrote:
>> On Tue, Mar 15, 2011 at 2:13 AM, Mahesh J Salgaonkar
>> <mahesh@xxxxxxxxxxxxxxxxxx> wrote:
>> >
>> > During free we do free all of them including RMO region. But since
>> > the rtas region is always on top of RMO, crashkernel memory overlaps
>> > rtas region and we endup freeing that even, which is causing the
>> > crash.
>> >
>> >
>> Okay, but with this patch applied, we will just ignore rtas region,
>> right?
> Correct.
>> Thus, when I echo 0 to free all the 128M crashkernel memory, the final
>> result will be 32M left, which means crash_size will still show 32M.
>> This looks odd.
>> How about skipping the 32M as a whole? I mean once the region being
>> freed has overlap with this rtas region, skip the whole rtas region,
>> and let crash_size
>> show 0?
> The existing code from crash_shrink_memory() function reduces the crash
> size to 0 when echo'ed 0. I did test this patchset and verified that
> /sys/kernel/kexec_crash_size show 0 value.

Oh, ok.

Acked-by: WANG Cong <xiyou.wangcong@xxxxxxxxx>


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