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 12/22] btrfs: keep track of discardable_bytes
Date: Wed, 20 Nov 2019 16:51:11 -0500
Message-ID: <1e8b884400b45f9a2f32ac4143b41abb27fd6fd4.1574282259.git.dennis@kernel.org> (raw)
In-Reply-To: <cover.1574282259.git.dennis@kernel.org>
In-Reply-To: <cover.1574282259.git.dennis@kernel.org>
Keep track of this metric so that we can understand how ahead or behind
we are in discarding rate.
Signed-off-by: Dennis Zhou <dennis@kernel.org>
---
fs/btrfs/ctree.h | 1 +
fs/btrfs/discard.c | 10 +++++++++
fs/btrfs/free-space-cache.c | 41 +++++++++++++++++++++++++++++--------
fs/btrfs/free-space-cache.h | 1 +
fs/btrfs/sysfs.c | 12 +++++++++++
5 files changed, 56 insertions(+), 9 deletions(-)
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index c37533a8a313..5b13bda52ab7 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -468,6 +468,7 @@ struct btrfs_discard_ctl {
struct btrfs_block_group *block_group;
struct list_head discard_list[BTRFS_NR_DISCARD_LISTS];
atomic_t discardable_extents;
+ atomic64_t discardable_bytes;
};
/* delayed seq elem */
diff --git a/fs/btrfs/discard.c b/fs/btrfs/discard.c
index a05180af74e2..074341c8242a 100644
--- a/fs/btrfs/discard.c
+++ b/fs/btrfs/discard.c
@@ -355,6 +355,7 @@ void btrfs_discard_update_discardable(struct btrfs_block_group *block_group,
{
struct btrfs_discard_ctl *discard_ctl;
s32 extents_delta;
+ s64 bytes_delta;
if (!block_group ||
!btrfs_test_opt(block_group->fs_info, DISCARD_ASYNC))
@@ -369,6 +370,14 @@ void btrfs_discard_update_discardable(struct btrfs_block_group *block_group,
ctl->discardable_extents[BTRFS_STAT_PREV] =
ctl->discardable_extents[BTRFS_STAT_CURR];
}
+
+ bytes_delta = (ctl->discardable_bytes[BTRFS_STAT_CURR] -
+ ctl->discardable_bytes[BTRFS_STAT_PREV]);
+ if (bytes_delta) {
+ atomic64_add(bytes_delta, &discard_ctl->discardable_bytes);
+ ctl->discardable_bytes[BTRFS_STAT_PREV] =
+ ctl->discardable_bytes[BTRFS_STAT_CURR];
+ }
}
/**
@@ -460,6 +469,7 @@ void btrfs_discard_init(struct btrfs_fs_info *fs_info)
INIT_LIST_HEAD(&discard_ctl->discard_list[i]);
atomic_set(&discard_ctl->discardable_extents, 0);
+ atomic64_set(&discard_ctl->discardable_bytes, 0);
}
void btrfs_discard_cleanup(struct btrfs_fs_info *fs_info)
diff --git a/fs/btrfs/free-space-cache.c b/fs/btrfs/free-space-cache.c
index b012be2b2213..c0a08c8df3dd 100644
--- a/fs/btrfs/free-space-cache.c
+++ b/fs/btrfs/free-space-cache.c
@@ -820,9 +820,11 @@ static int __load_free_space_cache(struct btrfs_root *root, struct inode *inode,
if (ret)
goto free_cache;
e->bitmap_extents = count_bitmap_extents(ctl, e);
- if (!btrfs_free_space_trimmed(e))
+ if (!btrfs_free_space_trimmed(e)) {
ctl->discardable_extents[BTRFS_STAT_CURR] +=
e->bitmap_extents;
+ ctl->discardable_bytes[BTRFS_STAT_CURR] += e->bytes;
+ }
}
io_ctl_drop_pages(&io_ctl);
@@ -1644,8 +1646,10 @@ __unlink_free_space(struct btrfs_free_space_ctl *ctl,
rb_erase(&info->offset_index, &ctl->free_space_offset);
ctl->free_extents--;
- if (!info->bitmap && !btrfs_free_space_trimmed(info))
+ if (!info->bitmap && !btrfs_free_space_trimmed(info)) {
ctl->discardable_extents[BTRFS_STAT_CURR]--;
+ ctl->discardable_bytes[BTRFS_STAT_CURR] -= info->bytes;
+ }
}
static void unlink_free_space(struct btrfs_free_space_ctl *ctl,
@@ -1666,8 +1670,10 @@ static int link_free_space(struct btrfs_free_space_ctl *ctl,
if (ret)
return ret;
- if (!info->bitmap && !btrfs_free_space_trimmed(info))
+ if (!info->bitmap && !btrfs_free_space_trimmed(info)) {
ctl->discardable_extents[BTRFS_STAT_CURR]++;
+ ctl->discardable_bytes[BTRFS_STAT_CURR] += info->bytes;
+ }
ctl->free_space += info->bytes;
ctl->free_extents++;
@@ -1746,8 +1752,10 @@ static inline void __bitmap_clear_bits(struct btrfs_free_space_ctl *ctl,
extent_delta++;
info->bitmap_extents += extent_delta;
- if (!btrfs_free_space_trimmed(info))
+ if (!btrfs_free_space_trimmed(info)) {
ctl->discardable_extents[BTRFS_STAT_CURR] += extent_delta;
+ ctl->discardable_bytes[BTRFS_STAT_CURR] -= bytes;
+ }
}
static void bitmap_clear_bits(struct btrfs_free_space_ctl *ctl,
@@ -1782,8 +1790,10 @@ static void bitmap_set_bits(struct btrfs_free_space_ctl *ctl,
extent_delta--;
info->bitmap_extents += extent_delta;
- if (!btrfs_free_space_trimmed(info))
+ if (!btrfs_free_space_trimmed(info)) {
ctl->discardable_extents[BTRFS_STAT_CURR] += extent_delta;
+ ctl->discardable_bytes[BTRFS_STAT_CURR] += bytes;
+ }
}
/*
@@ -2054,9 +2064,11 @@ static u64 add_bytes_to_bitmap(struct btrfs_free_space_ctl *ctl,
* whole bitmap untrimmed if at any point we add untrimmed regions.
*/
if (trim_state == BTRFS_TRIM_STATE_UNTRIMMED) {
- if (btrfs_free_space_trimmed(info))
+ if (btrfs_free_space_trimmed(info)) {
ctl->discardable_extents[BTRFS_STAT_CURR] +=
info->bitmap_extents;
+ ctl->discardable_bytes[BTRFS_STAT_CURR] += info->bytes;
+ }
info->trim_state = BTRFS_TRIM_STATE_UNTRIMMED;
}
@@ -2691,15 +2703,21 @@ __btrfs_return_cluster_to_free_space(
bitmap = (entry->bitmap != NULL);
if (!bitmap) {
/* merging treats extents as if they were new */
- if (!btrfs_free_space_trimmed(entry))
+ if (!btrfs_free_space_trimmed(entry)) {
ctl->discardable_extents[BTRFS_STAT_CURR]--;
+ ctl->discardable_bytes[BTRFS_STAT_CURR] -=
+ entry->bytes;
+ }
try_merge_free_space(ctl, entry, false);
steal_from_bitmap(ctl, entry, false);
/* as we insert directly, update these statistics */
- if (!btrfs_free_space_trimmed(entry))
+ if (!btrfs_free_space_trimmed(entry)) {
ctl->discardable_extents[BTRFS_STAT_CURR]++;
+ ctl->discardable_bytes[BTRFS_STAT_CURR] +=
+ entry->bytes;
+ }
}
tree_insert_offset(&ctl->free_space_offset,
entry->offset, &entry->offset_index, bitmap);
@@ -2990,6 +3008,8 @@ u64 btrfs_alloc_from_cluster(struct btrfs_block_group *block_group,
spin_lock(&ctl->tree_lock);
ctl->free_space -= bytes;
+ if (!entry->bitmap && !btrfs_free_space_trimmed(entry))
+ ctl->discardable_bytes[BTRFS_STAT_CURR] -= bytes;
if (entry->bytes == 0) {
ctl->free_extents--;
if (entry->bitmap) {
@@ -3495,9 +3515,11 @@ static void reset_trimming_bitmap(struct btrfs_free_space_ctl *ctl, u64 offset)
entry = tree_search_offset(ctl, offset, 1, 0);
if (entry) {
- if (btrfs_free_space_trimmed(entry))
+ if (btrfs_free_space_trimmed(entry)) {
ctl->discardable_extents[BTRFS_STAT_CURR] +=
entry->bitmap_extents;
+ ctl->discardable_bytes[BTRFS_STAT_CURR] += entry->bytes;
+ }
entry->trim_state = BTRFS_TRIM_STATE_UNTRIMMED;
}
@@ -3511,6 +3533,7 @@ static void end_trimming_bitmap(struct btrfs_free_space_ctl *ctl,
entry->trim_state = BTRFS_TRIM_STATE_TRIMMED;
ctl->discardable_extents[BTRFS_STAT_CURR] -=
entry->bitmap_extents;
+ ctl->discardable_bytes[BTRFS_STAT_CURR] -= entry->bytes;
}
}
diff --git a/fs/btrfs/free-space-cache.h b/fs/btrfs/free-space-cache.h
index 56235391a04a..b61b52eeaaf3 100644
--- a/fs/btrfs/free-space-cache.h
+++ b/fs/btrfs/free-space-cache.h
@@ -52,6 +52,7 @@ struct btrfs_free_space_ctl {
int unit;
u64 start;
s32 discardable_extents[BTRFS_STAT_NR_ENTRIES];
+ s64 discardable_bytes[BTRFS_STAT_NR_ENTRIES];
const struct btrfs_free_space_op *op;
void *private;
struct mutex cache_writeout_mutex;
diff --git a/fs/btrfs/sysfs.c b/fs/btrfs/sysfs.c
index 220d77c38363..07098f6d62bd 100644
--- a/fs/btrfs/sysfs.c
+++ b/fs/btrfs/sysfs.c
@@ -355,8 +355,20 @@ static ssize_t btrfs_discardable_extents_show(struct kobject *kobj,
}
BTRFS_ATTR(discard, discardable_extents, btrfs_discardable_extents_show);
+static ssize_t btrfs_discardable_bytes_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, "%lld\n",
+ atomic64_read(&fs_info->discard_ctl.discardable_bytes));
+}
+BTRFS_ATTR(discard, discardable_bytes, btrfs_discardable_bytes_show);
+
static const struct attribute *discard_debug_attrs[] = {
BTRFS_ATTR_PTR(discard, discardable_extents),
+ BTRFS_ATTR_PTR(discard, discardable_bytes),
NULL,
};
--
2.17.1
next prev parent reply index
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-20 21:50 [PATCH v3 00/22] btrfs: async discard support Dennis Zhou
2019-11-20 21:51 ` [PATCH 01/22] bitmap: genericize percpu bitmap region iterators Dennis Zhou
2019-11-20 21:51 ` [PATCH 02/22] btrfs: rename DISCARD opt to DISCARD_SYNC Dennis Zhou
2019-11-20 21:51 ` [PATCH 03/22] btrfs: keep track of which extents have been discarded Dennis Zhou
2019-11-20 21:51 ` [PATCH 04/22] btrfs: keep track of cleanliness of the bitmap Dennis Zhou
2019-11-23 0:17 ` kbuild test robot
2019-11-25 13:59 ` David Sterba
2019-11-25 19:37 ` Dennis Zhou
2019-11-20 21:51 ` [PATCH 05/22] btrfs: add the beginning of async discard, discard workqueue Dennis Zhou
2019-11-20 21:51 ` [PATCH 06/22] btrfs: handle empty block_group removal Dennis Zhou
2019-11-20 21:51 ` [PATCH 07/22] btrfs: discard one region at a time in async discard Dennis Zhou
2019-11-20 21:51 ` [PATCH 08/22] btrfs: add removal calls for sysfs debug/ Dennis Zhou
2019-11-20 21:51 ` [PATCH 09/22] btrfs: make UUID/debug have its own kobject Dennis Zhou
2019-11-20 21:51 ` [PATCH 10/22] btrfs: add discard sysfs directory Dennis Zhou
2019-11-20 21:51 ` [PATCH 11/22] btrfs: track discardable extents for async discard Dennis Zhou
2019-11-20 21:51 ` Dennis Zhou [this message]
2019-11-20 21:51 ` [PATCH 13/22] btrfs: calculate discard delay based on number of extents Dennis Zhou
2019-11-20 21:51 ` [PATCH 14/22] btrfs: add bps discard rate limit Dennis Zhou
2019-11-20 21:51 ` [PATCH 15/22] btrfs: limit max discard size for async discard Dennis Zhou
2019-11-20 21:51 ` [PATCH 16/22] btrfs: make max async discard size tunable Dennis Zhou
2019-11-20 21:51 ` [PATCH 17/22] btrfs: have multiple discard lists Dennis Zhou
2019-11-20 21:51 ` [PATCH 18/22] btrfs: only keep track of data extents for async discard Dennis Zhou
2019-11-20 21:51 ` [PATCH 19/22] btrfs: keep track of discard reuse stats Dennis Zhou
2019-11-20 21:51 ` [PATCH 20/22] btrfs: add async discard header Dennis Zhou
2019-11-20 21:51 ` [PATCH 21/22] btrfs: increase the metadata allowance for the free_space_cache Dennis Zhou
2019-11-20 21:51 ` [PATCH 22/22] btrfs: make smaller extents more likely to go into bitmaps Dennis Zhou
-- strict thread matches above, loose matches on Subject: below --
2019-12-14 0:22 [PATCH v6 00/22] btrfs: async discard support Dennis Zhou
2019-12-14 0:22 ` [PATCH 12/22] btrfs: keep track of discardable_bytes Dennis Zhou
2019-12-09 19:45 [PATCH v5 00/22] btrfs: async discard support Dennis Zhou
2019-12-09 19:45 ` [PATCH 12/22] btrfs: keep track of discardable_bytes Dennis Zhou
2019-11-25 19:46 [PATCH v4 00/22] btrfs: async discard support Dennis Zhou
2019-11-25 19:46 ` [PATCH 12/22] btrfs: keep track of discardable_bytes Dennis Zhou
2019-10-23 22:52 [PATCH v2 00/22] btrfs: async discard support Dennis Zhou
2019-10-23 22:53 ` [PATCH 12/22] btrfs: keep track of discardable_bytes Dennis Zhou
2019-11-08 19:31 ` Josef Bacik
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