diff options
| author | Cliff Wickman | 2010-09-16 18:44:02 +0200 |
|---|---|---|
| committer | Ingo Molnar | 2010-09-17 09:11:56 +0200 |
| commit | 3ee48b6af49cf534ca2f481ecc484b156a41451d (patch) | |
| tree | ce55b9d5831a39ff75297c9fbfa8fa3471c99a3d /arch | |
| parent | x86, kdump: Change copy_oldmem_page() to use cached addressing (diff) | |
| download | kernel-qcow2-linux-3ee48b6af49cf534ca2f481ecc484b156a41451d.tar.gz kernel-qcow2-linux-3ee48b6af49cf534ca2f481ecc484b156a41451d.tar.xz kernel-qcow2-linux-3ee48b6af49cf534ca2f481ecc484b156a41451d.zip | |
mm, x86: Saving vmcore with non-lazy freeing of vmas
During the reading of /proc/vmcore the kernel is doing
ioremap()/iounmap() repeatedly. And the buildup of un-flushed
vm_area_struct's is causing a great deal of overhead. (rb_next()
is chewing up most of that time).
This solution is to provide function set_iounmap_nonlazy(). It
causes a subsequent call to iounmap() to immediately purge the
vma area (with try_purge_vmap_area_lazy()).
With this patch we have seen the time for writing a 250MB
compressed dump drop from 71 seconds to 44 seconds.
Signed-off-by: Cliff Wickman <cpw@sgi.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: kexec@lists.infradead.org
Cc: <stable@kernel.org>
LKML-Reference: <E1OwHZ4-0005WK-Tw@eag09.americas.sgi.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/include/asm/io.h | 1 | ||||
| -rw-r--r-- | arch/x86/kernel/crash_dump_64.c | 1 |
2 files changed, 2 insertions, 0 deletions
diff --git a/arch/x86/include/asm/io.h b/arch/x86/include/asm/io.h index 30a3e9776123..6a45ec41ec26 100644 --- a/arch/x86/include/asm/io.h +++ b/arch/x86/include/asm/io.h @@ -206,6 +206,7 @@ static inline void __iomem *ioremap(resource_size_t offset, unsigned long size) extern void iounmap(volatile void __iomem *addr); +extern void set_iounmap_nonlazy(void); #ifdef __KERNEL__ diff --git a/arch/x86/kernel/crash_dump_64.c b/arch/x86/kernel/crash_dump_64.c index bf43188ca654..994828899e09 100644 --- a/arch/x86/kernel/crash_dump_64.c +++ b/arch/x86/kernel/crash_dump_64.c @@ -46,6 +46,7 @@ ssize_t copy_oldmem_page(unsigned long pfn, char *buf, } else memcpy(buf, vaddr + offset, csize); + set_iounmap_nonlazy(); iounmap(vaddr); return csize; } |