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Message-Id: <1293952756-15010-233-git-send-email-paul.gortmaker@windriver.com>
Date: Sun, 2 Jan 2011 02:18:48 -0500
From: Paul Gortmaker <paul.gortmaker@...driver.com>
To: stable@...nel.org, linux-kernel@...r.kernel.org
Cc: stable-review@...nel.org, Cliff Wickman <cpw@....com>,
kexec@...ts.infradead.org, Ingo Molnar <mingo@...e.hu>,
Paul Gortmaker <paul.gortmaker@...driver.com>
Subject: [34-longterm 232/260] x86, kdump: Change copy_oldmem_page() to use cached addressing
From: Cliff Wickman <cpw@....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@....com>
Acked-by: "Eric W. Biederman" <ebiederm@...ssion.com>
Cc: kexec@...ts.infradead.org
LKML-Reference: <E1OtMLz-0001yp-Ia@...09.americas.sgi.com>
Signed-off-by: Ingo Molnar <mingo@...e.hu>
Signed-off-by: Paul Gortmaker <paul.gortmaker@...driver.com>
---
arch/x86/kernel/crash_dump_64.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/arch/x86/kernel/crash_dump_64.c b/arch/x86/kernel/crash_dump_64.c
index ce96a6b..9948288 100644
--- 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 pfn, char *buf,
if (!csize)
return 0;
- vaddr = ioremap(pfn << PAGE_SHIFT, PAGE_SIZE);
+ vaddr = ioremap_cache(pfn << PAGE_SHIFT, PAGE_SIZE);
if (!vaddr)
return -ENOMEM;
--
1.7.3.3
--
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