diff options
| author | Andrew Morton <akpm@osdl.org> | 2004-04-19 17:22:03 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2004-04-19 17:22:03 -0700 |
| commit | d614d3153f8acc606f0c0644831b7c0d359a6b2c (patch) | |
| tree | 4eca55e721735885f8d0ec8bcc38944a7e6a1410 /include/linux | |
| parent | e8b338d65b58d871751253d3357cda7143053040 (diff) | |
[PATCH] fix madvise(MADV_DONTNEED) for nonlinear vmas
From: Hugh Dickins <hugh@veritas.com>
Jamie points out that madvise(MADV_DONTNEED) should unmap pages from a
nonlinear area in such a way that the nonlinear offsets are preserved if the
pages do turn out to be needed later after all, instead of reverting them to
linearity: needs to pass down a zap_details block.
(But this still leaves mincore unaware of nonlinear vmas: bigger job.)
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/mm.h | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/include/linux/mm.h b/include/linux/mm.h index d664c4ffbcc7..103f14358d1f 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -439,7 +439,16 @@ struct file *shmem_file_setup(char * name, loff_t size, unsigned long flags); void shmem_lock(struct file * file, int lock); int shmem_zero_setup(struct vm_area_struct *); -struct zap_details; +/* + * Parameter block passed down to zap_pte_range in exceptional cases. + */ +struct zap_details { + struct vm_area_struct *nonlinear_vma; /* Check page->index if set */ + struct address_space *check_mapping; /* Check page->mapping if set */ + pgoff_t first_index; /* Lowest page->index to unmap */ + pgoff_t last_index; /* Highest page->index to unmap */ +}; + void zap_page_range(struct vm_area_struct *vma, unsigned long address, unsigned long size, struct zap_details *); int unmap_vmas(struct mmu_gather **tlbp, struct mm_struct *mm, |