diff options
author | Abhijit Karmarkar <abhijitk@veritas.com> | 2005-06-21 17:15:13 -0700 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-06-21 18:46:21 -0700 |
commit | b4955ce3dd0818b56da532a16c9a4a3804a558ee (patch) | |
tree | 6e01667181bfc495b56e39748783ad2235a4f56e /include/asm-h8300/page_offset.h | |
parent | c475a8ab625d567eacf5e30ec35d6d8704558062 (diff) |
[PATCH] msync: check pte dirty earlier
It's common practice to msync a large address range regularly, in which
often only a few ptes have actually been dirtied since the previous pass.
sync_pte_range then goes much faster if it tests whether pte is dirty
before locating and accessing each struct page cacheline; and it is hardly
slowed by ptep_clear_flush_dirty repeating that test in the opposite case,
when every pte actually is dirty.
But beware, s390's pte_dirty always says false, since its dirty bit is kept
in the storage key, located via the struct page address. So skip this
optimization in its case: use a pte_maybe_dirty macro which just says true
if page_test_and_clear_dirty is implemented.
Signed-off-by: Abhijit Karmarkar <abhijitk@veritas.com>
Signed-off-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/asm-h8300/page_offset.h')
0 files changed, 0 insertions, 0 deletions