* [21/82] x86, kdump: Change copy_oldmem_page() to use cached addressing
@ 2010-11-19 21:55 ` Greg KH
0 siblings, 0 replies; 2+ messages in thread
From: Greg KH @ 2010-11-19 21:55 UTC (permalink / raw)
To: linux-kernel, stable
Cc: stable-review, torvalds, akpm, alan, Cliff Wickman,
Eric W. Biederman, kexec, Ingo Molnar
2.6.35-stable review patch. If anyone has any objections, please let us know.
------------------
From: Cliff Wickman <cpw@sgi.com>
commit 37a2f9f30a360fb03522d15c85c78265ccd80287 upstream.
The copy of /proc/vmcore to a user buffer proceeds much faster
if the kernel addresses memory as cached.
With this patch we have seen an increase in transfer rate from
less than 15MB/s to 80-460MB/s, depending on size of the
transfer. This makes a big difference in time needed to save a
system dump.
Signed-off-by: Cliff Wickman <cpw@sgi.com>
Acked-by: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: kexec@lists.infradead.org
LKML-Reference: <E1OtMLz-0001yp-Ia@eag09.americas.sgi.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---
arch/x86/kernel/crash_dump_64.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/arch/x86/kernel/crash_dump_64.c
+++ b/arch/x86/kernel/crash_dump_64.c
@@ -34,7 +34,7 @@ ssize_t copy_oldmem_page(unsigned long p
if (!csize)
return 0;
- vaddr = ioremap(pfn << PAGE_SHIFT, PAGE_SIZE);
+ vaddr = ioremap_cache(pfn << PAGE_SHIFT, PAGE_SIZE);
if (!vaddr)
return -ENOMEM;
^ permalink raw reply [flat|nested] 2+ messages in thread
* [21/82] x86, kdump: Change copy_oldmem_page() to use cached addressing
@ 2010-11-19 21:55 ` Greg KH
0 siblings, 0 replies; 2+ messages in thread
From: Greg KH @ 2010-11-19 21:55 UTC (permalink / raw)
To: linux-kernel, stable
Cc: Ingo Molnar, kexec, Cliff Wickman, Eric W. Biederman, akpm,
torvalds, stable-review, alan
2.6.35-stable review patch. If anyone has any objections, please let us know.
------------------
From: Cliff Wickman <cpw@sgi.com>
commit 37a2f9f30a360fb03522d15c85c78265ccd80287 upstream.
The copy of /proc/vmcore to a user buffer proceeds much faster
if the kernel addresses memory as cached.
With this patch we have seen an increase in transfer rate from
less than 15MB/s to 80-460MB/s, depending on size of the
transfer. This makes a big difference in time needed to save a
system dump.
Signed-off-by: Cliff Wickman <cpw@sgi.com>
Acked-by: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: kexec@lists.infradead.org
LKML-Reference: <E1OtMLz-0001yp-Ia@eag09.americas.sgi.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---
arch/x86/kernel/crash_dump_64.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/arch/x86/kernel/crash_dump_64.c
+++ b/arch/x86/kernel/crash_dump_64.c
@@ -34,7 +34,7 @@ ssize_t copy_oldmem_page(unsigned long p
if (!csize)
return 0;
- vaddr = ioremap(pfn << PAGE_SHIFT, PAGE_SIZE);
+ vaddr = ioremap_cache(pfn << PAGE_SHIFT, PAGE_SIZE);
if (!vaddr)
return -ENOMEM;
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^ permalink raw reply [flat|nested] 2+ messages in thread
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2010-11-19 21:55 ` Greg KH
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