From: Dennis Zhou <dennis@kernel.org>
To: David Sterba <dsterba@suse.com>, Chris Mason <clm@fb.com>,
Josef Bacik <josef@toxicpanda.com>,
Omar Sandoval <osandov@osandov.com>
Cc: kernel-team@fb.com, linux-btrfs@vger.kernel.org,
Dennis Zhou <dennis@kernel.org>
Subject: [PATCH 16/22] btrfs: make max async discard size tunable
Date: Mon, 9 Dec 2019 11:46:01 -0800 [thread overview]
Message-ID: <3d4bae458b7c629ceab70870ba663ef6f5bbc317.1575919746.git.dennis@kernel.org> (raw)
In-Reply-To: <cover.1575919745.git.dennis@kernel.org>
In-Reply-To: <cover.1575919745.git.dennis@kernel.org>
Expose max_discard_size as a tunable via sysfs.
Signed-off-by: Dennis Zhou <dennis@kernel.org>
---
fs/btrfs/ctree.h | 1 +
fs/btrfs/discard.c | 1 +
fs/btrfs/free-space-cache.c | 19 ++++++++++++-------
fs/btrfs/sysfs.c | 31 +++++++++++++++++++++++++++++++
4 files changed, 45 insertions(+), 7 deletions(-)
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 2d7354b5e312..2f7bead5ae25 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -470,6 +470,7 @@ struct btrfs_discard_ctl {
u64 prev_discard;
atomic_t discardable_extents;
atomic64_t discardable_bytes;
+ u64 max_discard_size;
u32 delay;
u32 iops_limit;
u64 bps_limit;
diff --git a/fs/btrfs/discard.c b/fs/btrfs/discard.c
index 085f36808e7f..dd5143f0283f 100644
--- a/fs/btrfs/discard.c
+++ b/fs/btrfs/discard.c
@@ -536,6 +536,7 @@ void btrfs_discard_init(struct btrfs_fs_info *fs_info)
discard_ctl->prev_discard = 0;
atomic_set(&discard_ctl->discardable_extents, 0);
atomic64_set(&discard_ctl->discardable_bytes, 0);
+ discard_ctl->max_discard_size = BTRFS_ASYNC_DISCARD_MAX_SIZE;
discard_ctl->delay = BTRFS_DISCARD_MAX_DELAY;
discard_ctl->iops_limit = BTRFS_DISCARD_MAX_IOPS;
discard_ctl->bps_limit = 0;
diff --git a/fs/btrfs/free-space-cache.c b/fs/btrfs/free-space-cache.c
index 0dbcea6c59f9..e5bb37627807 100644
--- a/fs/btrfs/free-space-cache.c
+++ b/fs/btrfs/free-space-cache.c
@@ -3431,6 +3431,8 @@ static int trim_no_bitmap(struct btrfs_block_group *block_group,
u64 *total_trimmed, u64 start, u64 end, u64 minlen,
bool async)
{
+ struct btrfs_discard_ctl *discard_ctl =
+ &block_group->fs_info->discard_ctl;
struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl;
struct btrfs_free_space *entry;
struct rb_node *node;
@@ -3439,6 +3441,7 @@ static int trim_no_bitmap(struct btrfs_block_group *block_group,
u64 extent_bytes;
enum btrfs_trim_state extent_trim_state;
u64 bytes;
+ u64 max_discard_size = READ_ONCE(discard_ctl->max_discard_size);
while (start < end) {
struct btrfs_trim_range trim_entry;
@@ -3476,11 +3479,10 @@ static int trim_no_bitmap(struct btrfs_block_group *block_group,
goto next;
}
unlink_free_space(ctl, entry);
- if (bytes > BTRFS_ASYNC_DISCARD_MAX_SIZE) {
- bytes = extent_bytes =
- BTRFS_ASYNC_DISCARD_MAX_SIZE;
- entry->offset += BTRFS_ASYNC_DISCARD_MAX_SIZE;
- entry->bytes -= BTRFS_ASYNC_DISCARD_MAX_SIZE;
+ if (max_discard_size && bytes > max_discard_size) {
+ bytes = extent_bytes = max_discard_size;
+ entry->offset += max_discard_size;
+ entry->bytes -= max_discard_size;
link_free_space(ctl, entry);
} else {
kmem_cache_free(btrfs_free_space_cachep, entry);
@@ -3589,12 +3591,15 @@ static int trim_bitmaps(struct btrfs_block_group *block_group,
u64 *total_trimmed, u64 start, u64 end, u64 minlen,
bool async)
{
+ struct btrfs_discard_ctl *discard_ctl =
+ &block_group->fs_info->discard_ctl;
struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl;
struct btrfs_free_space *entry;
int ret = 0;
int ret2;
u64 bytes;
u64 offset = offset_to_bitmap(ctl, start);
+ u64 max_discard_size = READ_ONCE(discard_ctl->max_discard_size);
while (offset < end) {
bool next_bitmap = false;
@@ -3664,8 +3669,8 @@ static int trim_bitmaps(struct btrfs_block_group *block_group,
goto next;
}
- if (async && bytes > BTRFS_ASYNC_DISCARD_MAX_SIZE)
- bytes = BTRFS_ASYNC_DISCARD_MAX_SIZE;
+ if (async && max_discard_size && bytes > max_discard_size)
+ bytes = max_discard_size;
bitmap_clear_bits(ctl, entry, start, bytes);
if (entry->bytes == 0)
diff --git a/fs/btrfs/sysfs.c b/fs/btrfs/sysfs.c
index 12f7a906a36f..e71e8bbc57d0 100644
--- a/fs/btrfs/sysfs.c
+++ b/fs/btrfs/sysfs.c
@@ -404,6 +404,36 @@ static ssize_t btrfs_discard_bps_limit_store(struct kobject *kobj,
BTRFS_ATTR_RW(discard, bps_limit, btrfs_discard_bps_limit_show,
btrfs_discard_bps_limit_store);
+static ssize_t btrfs_discard_max_discard_size_show(struct kobject *kobj,
+ struct kobj_attribute *a,
+ char *buf)
+{
+ struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj);
+
+ return snprintf(buf, PAGE_SIZE, "%llu\n",
+ READ_ONCE(fs_info->discard_ctl.max_discard_size));
+}
+
+static ssize_t btrfs_discard_max_discard_size_store(struct kobject *kobj,
+ struct kobj_attribute *a,
+ const char *buf, size_t len)
+{
+ struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj);
+ struct btrfs_discard_ctl *discard_ctl = &fs_info->discard_ctl;
+ u64 max_discard_size;
+ int ret;
+
+ ret = kstrtou64(buf, 10, &max_discard_size);
+ if (ret)
+ return -EINVAL;
+
+ WRITE_ONCE(discard_ctl->max_discard_size, max_discard_size);
+
+ return len;
+}
+BTRFS_ATTR_RW(discard, max_discard_size, btrfs_discard_max_discard_size_show,
+ btrfs_discard_max_discard_size_store);
+
static ssize_t btrfs_discardable_extents_show(struct kobject *kobj,
struct kobj_attribute *a,
char *buf)
@@ -429,6 +459,7 @@ BTRFS_ATTR(discard, discardable_bytes, btrfs_discardable_bytes_show);
static const struct attribute *discard_debug_attrs[] = {
BTRFS_ATTR_PTR(discard, iops_limit),
BTRFS_ATTR_PTR(discard, bps_limit),
+ BTRFS_ATTR_PTR(discard, max_discard_size),
BTRFS_ATTR_PTR(discard, discardable_extents),
BTRFS_ATTR_PTR(discard, discardable_bytes),
NULL,
--
2.17.1
next prev parent reply other threads:[~2019-12-09 19:46 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-09 19:45 [PATCH v5 00/22] btrfs: async discard support Dennis Zhou
2019-12-09 19:45 ` [PATCH 01/22] bitmap: genericize percpu bitmap region iterators Dennis Zhou
2019-12-09 19:45 ` [PATCH 02/22] btrfs: rename DISCARD opt to DISCARD_SYNC Dennis Zhou
2019-12-09 19:45 ` [PATCH 03/22] btrfs: keep track of which extents have been discarded Dennis Zhou
2019-12-09 19:45 ` [PATCH 04/22] btrfs: keep track of cleanliness of the bitmap Dennis Zhou
2019-12-09 19:45 ` [PATCH 05/22] btrfs: add the beginning of async discard, discard workqueue Dennis Zhou
2019-12-09 19:45 ` [PATCH 06/22] btrfs: handle empty block_group removal Dennis Zhou
2019-12-09 19:45 ` [PATCH 07/22] btrfs: discard one region at a time in async discard Dennis Zhou
2019-12-09 19:45 ` [PATCH 08/22] btrfs: add removal calls for sysfs debug/ Dennis Zhou
2019-12-09 19:45 ` [PATCH 09/22] btrfs: make UUID/debug have its own kobject Dennis Zhou
2019-12-09 19:45 ` [PATCH 10/22] btrfs: add discard sysfs directory Dennis Zhou
2019-12-09 19:45 ` [PATCH 11/22] btrfs: track discardable extents for async discard Dennis Zhou
2019-12-09 19:45 ` [PATCH 12/22] btrfs: keep track of discardable_bytes Dennis Zhou
2019-12-09 19:45 ` [PATCH 13/22] btrfs: calculate discard delay based on number of extents Dennis Zhou
2019-12-09 19:45 ` [PATCH 14/22] btrfs: add bps discard rate limit Dennis Zhou
2019-12-09 19:46 ` [PATCH 15/22] btrfs: limit max discard size for async discard Dennis Zhou
2019-12-09 19:46 ` Dennis Zhou [this message]
2019-12-09 19:46 ` [PATCH 17/22] btrfs: have multiple discard lists Dennis Zhou
2019-12-09 19:46 ` [PATCH 18/22] btrfs: only keep track of data extents for async discard Dennis Zhou
2019-12-09 19:46 ` [PATCH 19/22] btrfs: keep track of discard reuse stats Dennis Zhou
2019-12-09 19:46 ` [PATCH 20/22] btrfs: add async discard header Dennis Zhou
2019-12-09 19:46 ` [PATCH 21/22] btrfs: increase the metadata allowance for the free_space_cache Dennis Zhou
2019-12-09 19:46 ` [PATCH 22/22] btrfs: make smaller extents more likely to go into bitmaps Dennis Zhou
2019-12-10 14:04 ` [PATCH v5 00/22] btrfs: async discard support David Sterba
-- strict thread matches above, loose matches on Subject: below --
2019-12-14 0:22 [PATCH v6 " Dennis Zhou
2019-12-14 0:22 ` [PATCH 16/22] btrfs: make max async discard size tunable Dennis Zhou
2019-12-30 18:05 ` David Sterba
2020-01-02 16:50 ` Dennis Zhou
2019-11-25 19:46 [PATCH v4 00/22] btrfs: async discard support Dennis Zhou
2019-11-25 19:46 ` [PATCH 16/22] btrfs: make max async discard size tunable Dennis Zhou
2019-11-20 21:50 [PATCH v3 00/22] btrfs: async discard support Dennis Zhou
2019-11-20 21:51 ` [PATCH 16/22] btrfs: make max async discard size tunable Dennis Zhou
2019-10-23 22:52 [PATCH v2 00/22] btrfs: async discard support Dennis Zhou
2019-10-23 22:53 ` [PATCH 16/22] btrfs: make max async discard size tunable Dennis Zhou
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