* [PATCH] Documentation: Update the default value of crashkernel low
@ 2015-09-24 8:51 Baoquan He
2015-09-24 21:44 ` Jonathan Corbet
0 siblings, 1 reply; 3+ messages in thread
From: Baoquan He @ 2015-09-24 8:51 UTC (permalink / raw)
To: linux-kernel; +Cc: corbet, akpm, joro, linux-doc, kexec, Baoquan He
In commit 94fb933 ("x86/crash: Allocate enough low memory when
crashkernel=high") the default value of crashkernel low memory
is changed to 256M. In this patch update it accordingly.
Signed-off-by: Baoquan He <bhe@redhat.com>
---
Documentation/kernel-parameters.txt | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 22a4b68..945bc0d 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -789,8 +789,10 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
is passed, kernel could allocate physical memory region
above 4G, that cause second kernel crash on system
that require some amount of low memory, e.g. swiotlb
- requires at least 64M+32K low memory. Kernel would
- try to allocate 72M below 4G automatically.
+ requires at least 64M+32K low memory, also enough extra
+ low memory is needed to make sure DMA buffers for 32-bit
+ devices won't run out. Kernel would try to allocate at
+ at least 256M below 4G automatically.
This one let user to specify own low range under 4G
for second kernel instead.
0: to disable low allocation.
--
2.1.0
^ permalink raw reply related [flat|nested] 3+ messages in thread* Re: [PATCH] Documentation: Update the default value of crashkernel low
2015-09-24 8:51 [PATCH] Documentation: Update the default value of crashkernel low Baoquan He
@ 2015-09-24 21:44 ` Jonathan Corbet
2015-09-25 3:30 ` Baoquan He
0 siblings, 1 reply; 3+ messages in thread
From: Jonathan Corbet @ 2015-09-24 21:44 UTC (permalink / raw)
To: Baoquan He; +Cc: linux-kernel, akpm, joro, linux-doc, kexec
On Thu, 24 Sep 2015 16:51:25 +0800
Baoquan He <bhe@redhat.com> wrote:
> In commit 94fb933 ("x86/crash: Allocate enough low memory when
> crashkernel=high") the default value of crashkernel low memory
> is changed to 256M. In this patch update it accordingly.
Applied to the docs tree, thanks.
jon
^ permalink raw reply [flat|nested] 3+ messages in thread* Re: [PATCH] Documentation: Update the default value of crashkernel low
2015-09-24 21:44 ` Jonathan Corbet
@ 2015-09-25 3:30 ` Baoquan He
0 siblings, 0 replies; 3+ messages in thread
From: Baoquan He @ 2015-09-25 3:30 UTC (permalink / raw)
To: Jonathan Corbet; +Cc: linux-kernel
On 09/24/15 at 03:44pm, Jonathan Corbet wrote:
> On Thu, 24 Sep 2015 16:51:25 +0800
> Baoquan He <bhe@redhat.com> wrote:
>
> > In commit 94fb933 ("x86/crash: Allocate enough low memory when
> > crashkernel=high") the default value of crashkernel low memory
> > is changed to 256M. In this patch update it accordingly.
>
> Applied to the docs tree, thanks.
Thanks, Jon.
^ permalink raw reply [flat|nested] 3+ messages in thread
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2015-09-24 8:51 [PATCH] Documentation: Update the default value of crashkernel low Baoquan He
2015-09-24 21:44 ` Jonathan Corbet
2015-09-25 3:30 ` Baoquan He
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