2.6.33-longterm review patch. If anyone has any objections, please let us know. ------------------ Content-Length: 1077 Lines: 35 From: Cliff Wickman <cpw@xxxxxxx> 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 at sgi.com> Acked-by: "Eric W. Biederman" <ebiederm at xmission.com> Cc: kexec at lists.infradead.org LKML-Reference: <E1OtMLz-0001yp-Ia at eag09.americas.sgi.com> Signed-off-by: Ingo Molnar <mingo at elte.hu> Signed-off-by: Greg Kroah-Hartman <gregkh at 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;
