From: Greg KH <gregkh@suse.de>
To: linux-kernel@vger.kernel.org, stable@kernel.org
Cc: Ingo Molnar <mingo@elte.hu>,
kexec@lists.infradead.org, Cliff Wickman <cpw@sgi.com>,
"Eric W. Biederman" <ebiederm@xmission.com>,
akpm@linux-foundation.org, torvalds@linux-foundation.org,
stable-review@kernel.org, alan@lxorguk.ukuu.org.uk
Subject: [23/66] x86, kdump: Change copy_oldmem_page() to use cached addressing
Date: Fri, 19 Nov 2010 14:00:54 -0800 [thread overview]
Message-ID: <20101119220124.061070267@clark.site> (raw)
In-Reply-To: <20101119220309.GA15562@kroah.com>
2.6.36-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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prev parent reply other threads:[~2010-11-19 22:04 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20101119220309.GA15562@kroah.com>
2010-11-19 22:00 ` [16/66] mm, x86: Saving vmcore with non-lazy freeing of vmas Greg KH
2010-11-19 22:00 ` Greg KH [this message]
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