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mm: drop zap_details::ignore_dirty 

The only user of ignore_dirty is oom-reaper.  But it doesn't really use
it.

ignore_dirty only has effect on file pages mapped with dirty pte.  But
oom-repear skips shared VMAs, so there's no way we can dirty file pte in
them.

Link: http://lkml.kernel.org/r/20170118122429.43661-1-kirill.shutemov@linux.intel.com
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Kirill A. Shutemov 2017-02-22 15:46:31 -08:00 committed by Linus Torvalds
parent 685dbf6f5a
commit da162e9368
3 changed files with 1 additions and 9 deletions
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1
include/linux/mm.h
View File

@ -1175,7 +1175,6 @@ struct zap_details {
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 */
bool ignore_dirty; /* Ignore dirty pages */
bool check_swap_entries; /* Check also swap entries */
};

6
mm/memory.c
View File

@ -1155,12 +1155,6 @@ static unsigned long zap_pte_range(struct mmu_gather *tlb,
if (!PageAnon(page)) {
if (pte_dirty(ptent)) {
/*
* oom_reaper cannot tear down dirty
* pages
*/
if (unlikely(details && details->ignore_dirty))
continue;
force_flush = 1;
set_page_dirty(page);
}

3
mm/oom_kill.c
View File

@ -465,8 +465,7 @@ static bool __oom_reap_task_mm(struct task_struct *tsk, struct mm_struct *mm)
{
struct mmu_gather tlb;
struct vm_area_struct *vma;
struct zap_details details = {.check_swap_entries = true,
.ignore_dirty = true};
struct zap_details details = {.check_swap_entries = true};
bool ret = true;
/*