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authorJeff Dike <jdike@addtoit.com>2005-09-03 15:57:36 -0700
committerLinus Torvalds <torvalds@evo.osdl.org>2005-09-05 00:06:22 -0700
commitc56004901fa5dcf55f92318f192ab3c0e87db2d1 (patch)
treeac53ded16ab9886ce05d4b2d424dfed80dce9e57 /arch/um/include
parent77fa5adcda6d686d2f45a2b55dcb9a03e7d33fa1 (diff)
[PATCH] uml: TLB operation batching
This adds VM op batching to skas0. Rather than having a context switch to and from the userspace stub for each address space change, we write a number of operations to the stub data page and invoke a different stub which loops over them and executes them all in one go. The operations are stored as [ system call number, arg1, arg2, ... ] tuples. The set is terminated by a system call number of 0. Single operations, i.e. page faults, are handled in the old way, since that is slightly more efficient. For a kernel build, a minority (~1/4) of the operations are part of a set. These sets averaged ~100 in length, so for this quarter, the context switching overhead is greatly reduced. Signed-off-by: Jeff Dike <jdike@addtoit.com> Cc: Paolo Giarrusso <blaisorblade@yahoo.it> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/um/include')
-rw-r--r--arch/um/include/tlb.h22
1 files changed, 4 insertions, 18 deletions
diff --git a/arch/um/include/tlb.h b/arch/um/include/tlb.h
index c6f9628f39b..2deefb99c63 100644
--- a/arch/um/include/tlb.h
+++ b/arch/um/include/tlb.h
@@ -9,7 +9,7 @@
#include "um_mmu.h"
struct host_vm_op {
- enum { MMAP, MUNMAP, MPROTECT } type;
+ enum { NONE, MMAP, MUNMAP, MPROTECT } type;
union {
struct {
unsigned long addr;
@@ -38,24 +38,10 @@ extern void mprotect_kernel_vm(int w);
extern void force_flush_all(void);
extern void fix_range_common(struct mm_struct *mm, unsigned long start_addr,
unsigned long end_addr, int force,
- void (*do_ops)(union mm_context *,
- struct host_vm_op *, int));
+ void *(*do_ops)(union mm_context *,
+ struct host_vm_op *, int, int,
+ void *));
extern int flush_tlb_kernel_range_common(unsigned long start,
unsigned long end);
-extern int add_mmap(unsigned long virt, unsigned long phys, unsigned long len,
- int r, int w, int x, struct host_vm_op *ops, int index,
- int last_filled, union mm_context *mmu,
- void (*do_ops)(union mm_context *, struct host_vm_op *,
- int));
-extern int add_munmap(unsigned long addr, unsigned long len,
- struct host_vm_op *ops, int index, int last_filled,
- union mm_context *mmu,
- void (*do_ops)(union mm_context *, struct host_vm_op *,
- int));
-extern int add_mprotect(unsigned long addr, unsigned long len, int r, int w,
- int x, struct host_vm_op *ops, int index,
- int last_filled, union mm_context *mmu,
- void (*do_ops)(union mm_context *, struct host_vm_op *,
- int));
#endif