diff options
| -rw-r--r-- | include/linux/writeback.h | 2 | ||||
| -rw-r--r-- | mm/page-writeback.c | 13 | ||||
| -rw-r--r-- | mm/vmscan.c | 2 |
3 files changed, 13 insertions, 4 deletions
diff --git a/include/linux/writeback.h b/include/linux/writeback.h index fc35e6b..0c78f7f 100644 --- a/include/linux/writeback.h +++ b/include/linux/writeback.h @@ -84,7 +84,7 @@ static inline void wait_on_inode(struct inode *inode) int wakeup_pdflush(long nr_pages); void laptop_io_completion(void); void laptop_sync_completion(void); -void throttle_vm_writeout(void); +void throttle_vm_writeout(gfp_t gfp_mask); /* These are exported to sysctl. */ extern int dirty_background_ratio; diff --git a/mm/page-writeback.c b/mm/page-writeback.c index f7e088f..f469e3c 100644 --- a/mm/page-writeback.c +++ b/mm/page-writeback.c @@ -296,11 +296,21 @@ void balance_dirty_pages_ratelimited_nr(struct address_space *mapping, } EXPORT_SYMBOL(balance_dirty_pages_ratelimited_nr); -void throttle_vm_writeout(void) +void throttle_vm_writeout(gfp_t gfp_mask) { long background_thresh; long dirty_thresh; + if ((gfp_mask & (__GFP_FS|__GFP_IO)) != (__GFP_FS|__GFP_IO)) { + /* + * The caller might hold locks which can prevent IO completion + * or progress in the filesystem. So we cannot just sit here + * waiting for IO to complete. + */ + congestion_wait(WRITE, HZ/10); + return; + } + for ( ; ; ) { get_dirty_limits(&background_thresh, &dirty_thresh, NULL); @@ -317,7 +327,6 @@ void throttle_vm_writeout(void) } } - /* * writeback at least _min_pages, and keep writing until the amount of dirty * memory is less than the background threshold, or until we're all clean. diff --git a/mm/vmscan.c b/mm/vmscan.c index 0655d5f..db023e2 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -952,7 +952,7 @@ static unsigned long shrink_zone(int priority, struct zone *zone, } } - throttle_vm_writeout(); + throttle_vm_writeout(sc->gfp_mask); atomic_dec(&zone->reclaim_in_progress); return nr_reclaimed; |