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authorJeremy Fitzhardinge <jeremy@goop.org>2007-05-02 13:27:14 -0400
committerAndi Kleen <andi@basil.nowhere.org>2007-05-02 13:27:14 -0400
commitd6dd61c831226f9cd7750885da04d360d6455101 (patch)
tree30f84a429821d207f7de5dd6225d3d9515042c0a /mm/mmap.c
parent5311ab62cdc7788784971ed816ce85e926f3e994 (diff)
[PATCH] x86: PARAVIRT: add hooks to intercept mm creation and destruction
Add hooks to allow a paravirt implementation to track the lifetime of an mm. Paravirtualization requires three hooks, but only two are needed in common code. They are: arch_dup_mmap, which is called when a new mmap is created at fork arch_exit_mmap, which is called when the last process reference to an mm is dropped, which typically happens on exit and exec. The third hook is activate_mm, which is called from the arch-specific activate_mm() macro/function, and so doesn't need stub versions for other architectures. It's called when an mm is first used. Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com> Signed-off-by: Andi Kleen <ak@suse.de> Cc: linux-arch@vger.kernel.org Cc: James Bottomley <James.Bottomley@SteelEye.com> Acked-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'mm/mmap.c')
-rw-r--r--mm/mmap.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/mm/mmap.c b/mm/mmap.c
index 84f997da78d7..88da687bde89 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -29,6 +29,7 @@
29#include <asm/uaccess.h> 29#include <asm/uaccess.h>
30#include <asm/cacheflush.h> 30#include <asm/cacheflush.h>
31#include <asm/tlb.h> 31#include <asm/tlb.h>
32#include <asm/mmu_context.h>
32 33
33#ifndef arch_mmap_check 34#ifndef arch_mmap_check
34#define arch_mmap_check(addr, len, flags) (0) 35#define arch_mmap_check(addr, len, flags) (0)
@@ -1979,6 +1980,9 @@ void exit_mmap(struct mm_struct *mm)
1979 unsigned long nr_accounted = 0; 1980 unsigned long nr_accounted = 0;
1980 unsigned long end; 1981 unsigned long end;
1981 1982
1983 /* mm's last user has gone, and its about to be pulled down */
1984 arch_exit_mmap(mm);
1985
1982 lru_add_drain(); 1986 lru_add_drain();
1983 flush_cache_mm(mm); 1987 flush_cache_mm(mm);
1984 tlb = tlb_gather_mmu(mm, 1); 1988 tlb = tlb_gather_mmu(mm, 1);