diff options
Diffstat (limited to 'mm/page-writeback.c')
| -rw-r--r-- | mm/page-writeback.c | 24 |
1 files changed, 18 insertions, 6 deletions
diff --git a/mm/page-writeback.c b/mm/page-writeback.c index 3d3848fa632..5e00f1772c2 100644 --- a/mm/page-writeback.c +++ b/mm/page-writeback.c @@ -69,6 +69,12 @@ static inline long sync_writeback_pages(void) int dirty_background_ratio = 5; /* + * free highmem will not be subtracted from the total free memory + * for calculating free ratios if vm_highmem_is_dirtyable is true + */ +int vm_highmem_is_dirtyable; + +/* * The generator of dirty data starts writeback at this percentage */ int vm_dirty_ratio = 10; @@ -219,7 +225,7 @@ static inline void task_dirties_fraction(struct task_struct *tsk, * * dirty -= (dirty/8) * p_{t} */ -void task_dirty_limit(struct task_struct *tsk, long *pdirty) +static void task_dirty_limit(struct task_struct *tsk, long *pdirty) { long numerator, denominator; long dirty = *pdirty; @@ -287,7 +293,10 @@ static unsigned long determine_dirtyable_memory(void) x = global_page_state(NR_FREE_PAGES) + global_page_state(NR_INACTIVE) + global_page_state(NR_ACTIVE); - x -= highmem_dirtyable_memory(x); + + if (!vm_highmem_is_dirtyable) + x -= highmem_dirtyable_memory(x); + return x + 1; /* Ensure that we never return 0 */ } @@ -558,6 +567,7 @@ static void background_writeout(unsigned long _min_pages) global_page_state(NR_UNSTABLE_NFS) < background_thresh && min_pages <= 0) break; + wbc.more_io = 0; wbc.encountered_congestion = 0; wbc.nr_to_write = MAX_WRITEBACK_PAGES; wbc.pages_skipped = 0; @@ -565,8 +575,9 @@ static void background_writeout(unsigned long _min_pages) min_pages -= MAX_WRITEBACK_PAGES - wbc.nr_to_write; if (wbc.nr_to_write > 0 || wbc.pages_skipped > 0) { /* Wrote less than expected */ - congestion_wait(WRITE, HZ/10); - if (!wbc.encountered_congestion) + if (wbc.encountered_congestion || wbc.more_io) + congestion_wait(WRITE, HZ/10); + else break; } } @@ -631,11 +642,12 @@ static void wb_kupdate(unsigned long arg) global_page_state(NR_UNSTABLE_NFS) + (inodes_stat.nr_inodes - inodes_stat.nr_unused); while (nr_to_write > 0) { + wbc.more_io = 0; wbc.encountered_congestion = 0; wbc.nr_to_write = MAX_WRITEBACK_PAGES; writeback_inodes(&wbc); if (wbc.nr_to_write > 0) { - if (wbc.encountered_congestion) + if (wbc.encountered_congestion || wbc.more_io) congestion_wait(WRITE, HZ/10); else break; /* All the old data is written */ @@ -1064,7 +1076,7 @@ static int __set_page_dirty(struct page *page) return 0; } -int fastcall set_page_dirty(struct page *page) +int set_page_dirty(struct page *page) { int ret = __set_page_dirty(page); if (ret) |