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| author | Cliff Wickman | 2010-09-08 17:14:27 +0200 |
|---|---|---|
| committer | Ingo Molnar | 2010-09-09 09:46:23 +0200 |
| commit | 37a2f9f30a360fb03522d15c85c78265ccd80287 (patch) | |
| tree | bcc77b64a38aff205daacea238cf0586e8301c68 /arch/x86/kernel/crash_dump_64.c | |
| parent | x86, mm: fix uninitialized addr in kernel_physical_mapping_init() (diff) | |
| download | kernel-qcow2-linux-37a2f9f30a360fb03522d15c85c78265ccd80287.tar.gz kernel-qcow2-linux-37a2f9f30a360fb03522d15c85c78265ccd80287.tar.xz kernel-qcow2-linux-37a2f9f30a360fb03522d15c85c78265ccd80287.zip | |
x86, kdump: Change copy_oldmem_page() to use cached addressing
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
Cc: <stable@kernel.org> # as far back as it would apply
LKML-Reference: <E1OtMLz-0001yp-Ia@eag09.americas.sgi.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/kernel/crash_dump_64.c')
| -rw-r--r-- | 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 045b36cada65..bf43188ca654 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; |