diff options
| -rw-r--r-- | Documentation/ABI/testing/sysfs-fs-f2fs | 12 | ||||
| -rw-r--r-- | Documentation/filesystems/f2fs.txt | 9 | ||||
| -rw-r--r-- | fs/f2fs/gc.c | 17 | ||||
| -rw-r--r-- | fs/f2fs/gc.h | 4 | ||||
| -rw-r--r-- | fs/f2fs/sysfs.c | 9 |
5 files changed, 49 insertions, 2 deletions
diff --git a/Documentation/ABI/testing/sysfs-fs-f2fs b/Documentation/ABI/testing/sysfs-fs-f2fs index 84c606fb3ca4..621da3fc56c5 100644 --- a/Documentation/ABI/testing/sysfs-fs-f2fs +++ b/Documentation/ABI/testing/sysfs-fs-f2fs @@ -130,3 +130,15 @@ Date: June 2017 Contact: "Chao Yu" <yuchao0@huawei.com> Description: Controls current reserved blocks in system. + +What: /sys/fs/f2fs/<disk>/gc_urgent +Date: August 2017 +Contact: "Jaegeuk Kim" <jaegeuk@kernel.org> +Description: + Do background GC agressively + +What: /sys/fs/f2fs/<disk>/gc_urgent_sleep_time +Date: August 2017 +Contact: "Jaegeuk Kim" <jaegeuk@kernel.org> +Description: + Controls sleep time of GC urgent mode diff --git a/Documentation/filesystems/f2fs.txt b/Documentation/filesystems/f2fs.txt index b8f495a8b67d..84f36896766c 100644 --- a/Documentation/filesystems/f2fs.txt +++ b/Documentation/filesystems/f2fs.txt @@ -210,6 +210,15 @@ Files in /sys/fs/f2fs/<devname> gc_idle = 1 will select the Cost Benefit approach & setting gc_idle = 2 will select the greedy approach. + gc_urgent This parameter controls triggering background GCs + urgently or not. Setting gc_urgent = 0 [default] + makes back to default behavior, while if it is set + to 1, background thread starts to do GC by given + gc_urgent_sleep_time interval. + + gc_urgent_sleep_time This parameter controls sleep time for gc_urgent. + 500 ms is set by default. See above gc_urgent. + reclaim_segments This parameter controls the number of prefree segments to be reclaimed. If the number of prefree segments is larger than the number of segments diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c index 620dca443b29..8da7c14a9d29 100644 --- a/fs/f2fs/gc.c +++ b/fs/f2fs/gc.c @@ -35,9 +35,14 @@ static int gc_thread_func(void *data) set_freezable(); do { wait_event_interruptible_timeout(*wq, - kthread_should_stop() || freezing(current), + kthread_should_stop() || freezing(current) || + gc_th->gc_wake, msecs_to_jiffies(wait_ms)); + /* give it a try one time */ + if (gc_th->gc_wake) + gc_th->gc_wake = 0; + if (try_to_freeze()) continue; if (kthread_should_stop()) @@ -74,6 +79,11 @@ static int gc_thread_func(void *data) if (!mutex_trylock(&sbi->gc_mutex)) goto next; + if (gc_th->gc_urgent) { + wait_ms = gc_th->urgent_sleep_time; + goto do_gc; + } + if (!is_idle(sbi)) { increase_sleep_time(gc_th, &wait_ms); mutex_unlock(&sbi->gc_mutex); @@ -84,7 +94,7 @@ static int gc_thread_func(void *data) decrease_sleep_time(gc_th, &wait_ms); else increase_sleep_time(gc_th, &wait_ms); - +do_gc: stat_inc_bggc_count(sbi); /* if return value is not zero, no victim was selected */ @@ -115,11 +125,14 @@ int start_gc_thread(struct f2fs_sb_info *sbi) goto out; } + gc_th->urgent_sleep_time = DEF_GC_THREAD_URGENT_SLEEP_TIME; gc_th->min_sleep_time = DEF_GC_THREAD_MIN_SLEEP_TIME; gc_th->max_sleep_time = DEF_GC_THREAD_MAX_SLEEP_TIME; gc_th->no_gc_sleep_time = DEF_GC_THREAD_NOGC_SLEEP_TIME; gc_th->gc_idle = 0; + gc_th->gc_urgent = 0; + gc_th->gc_wake= 0; sbi->gc_thread = gc_th; init_waitqueue_head(&sbi->gc_thread->gc_wait_queue_head); diff --git a/fs/f2fs/gc.h b/fs/f2fs/gc.h index a993967dcdb9..57a9000ce3af 100644 --- a/fs/f2fs/gc.h +++ b/fs/f2fs/gc.h @@ -13,6 +13,7 @@ * whether IO subsystem is idle * or not */ +#define DEF_GC_THREAD_URGENT_SLEEP_TIME 500 /* 500 ms */ #define DEF_GC_THREAD_MIN_SLEEP_TIME 30000 /* milliseconds */ #define DEF_GC_THREAD_MAX_SLEEP_TIME 60000 #define DEF_GC_THREAD_NOGC_SLEEP_TIME 300000 /* wait 5 min */ @@ -27,12 +28,15 @@ struct f2fs_gc_kthread { wait_queue_head_t gc_wait_queue_head; /* for gc sleep time */ + unsigned int urgent_sleep_time; unsigned int min_sleep_time; unsigned int max_sleep_time; unsigned int no_gc_sleep_time; /* for changing gc mode */ unsigned int gc_idle; + unsigned int gc_urgent; + unsigned int gc_wake; }; struct gc_inode_list { diff --git a/fs/f2fs/sysfs.c b/fs/f2fs/sysfs.c index 3d6bbdb743b0..c40e5d24df9f 100644 --- a/fs/f2fs/sysfs.c +++ b/fs/f2fs/sysfs.c @@ -156,6 +156,10 @@ static ssize_t f2fs_sbi_store(struct f2fs_attr *a, if (!strcmp(a->attr.name, "iostat_enable") && *ui == 0) f2fs_reset_iostat(sbi); + if (!strcmp(a->attr.name, "gc_urgent") && t == 1 && sbi->gc_thread) { + sbi->gc_thread->gc_wake = 1; + wake_up_interruptible_all(&sbi->gc_thread->gc_wait_queue_head); + } return count; } @@ -235,10 +239,13 @@ static struct f2fs_attr f2fs_attr_##_name = { \ .id = _id, \ } +F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_urgent_sleep_time, + urgent_sleep_time); F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_min_sleep_time, min_sleep_time); F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_max_sleep_time, max_sleep_time); F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_no_gc_sleep_time, no_gc_sleep_time); F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_idle, gc_idle); +F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_urgent, gc_urgent); F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, reclaim_segments, rec_prefree_segments); F2FS_RW_ATTR(DCC_INFO, discard_cmd_control, max_small_discards, max_discards); F2FS_RW_ATTR(RESERVED_BLOCKS, f2fs_sb_info, reserved_blocks, reserved_blocks); @@ -275,10 +282,12 @@ F2FS_FEATURE_RO_ATTR(inode_checksum, FEAT_INODE_CHECKSUM); #define ATTR_LIST(name) (&f2fs_attr_##name.attr) static struct attribute *f2fs_attrs[] = { + ATTR_LIST(gc_urgent_sleep_time), ATTR_LIST(gc_min_sleep_time), ATTR_LIST(gc_max_sleep_time), ATTR_LIST(gc_no_gc_sleep_time), ATTR_LIST(gc_idle), + ATTR_LIST(gc_urgent), ATTR_LIST(reclaim_segments), ATTR_LIST(max_small_discards), ATTR_LIST(batched_trim_sections), |