c56004901f
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>
48 lines
1002 B
C
48 lines
1002 B
C
/*
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* Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
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* Licensed under the GPL
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*/
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#ifndef __TLB_H__
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#define __TLB_H__
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#include "um_mmu.h"
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struct host_vm_op {
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enum { NONE, MMAP, MUNMAP, MPROTECT } type;
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union {
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struct {
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unsigned long addr;
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unsigned long len;
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unsigned int r:1;
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unsigned int w:1;
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unsigned int x:1;
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int fd;
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__u64 offset;
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} mmap;
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struct {
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unsigned long addr;
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unsigned long len;
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} munmap;
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struct {
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unsigned long addr;
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unsigned long len;
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unsigned int r:1;
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unsigned int w:1;
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unsigned int x:1;
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} mprotect;
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} u;
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};
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extern void mprotect_kernel_vm(int w);
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extern void force_flush_all(void);
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extern void fix_range_common(struct mm_struct *mm, unsigned long start_addr,
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unsigned long end_addr, int force,
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void *(*do_ops)(union mm_context *,
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struct host_vm_op *, int, int,
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void *));
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extern int flush_tlb_kernel_range_common(unsigned long start,
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unsigned long end);
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#endif
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