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authorCliff Wickman <cpw@sgi.com>2010-09-08 19:14:27 +0400
committerIngo Molnar <mingo@elte.hu>2010-09-09 11:46:23 +0400
commit37a2f9f30a360fb03522d15c85c78265ccd80287 (patch)
treebcc77b64a38aff205daacea238cf0586e8301c68 /mm/vmalloc.c
parent1c5f50ee347daea013671f718b70cd6bf497bef9 (diff)
downloadlinux-37a2f9f30a360fb03522d15c85c78265ccd80287.tar.xz
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 'mm/vmalloc.c')
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