From: Jaegeuk Kim <jaegeuk@kernel.org> To: linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net Cc: Jaegeuk Kim <jaegeuk@kernel.org> Subject: [PATCH 2/2] f2fs: shrink unreferenced extent_caches first Date: Tue, 30 Jun 2015 18:25:46 -0700 [thread overview] Message-ID: <1435713946-6910-2-git-send-email-jaegeuk@kernel.org> (raw) In-Reply-To: <1435713946-6910-1-git-send-email-jaegeuk@kernel.org> If an extent_tree entry has a zero reference count, we can drop it from the cache in higher priority rather than currently referencing entries. Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org> --- fs/f2fs/data.c | 51 +++++++++++++++++++++++++++++++++++++++++---------- 1 file changed, 41 insertions(+), 10 deletions(-) diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c index 8f059e0..a0a0e2b 100644 --- a/fs/f2fs/data.c +++ b/fs/f2fs/data.c @@ -661,21 +661,54 @@ unsigned int f2fs_shrink_extent_tree(struct f2fs_sb_info *sbi, int nr_shrink) struct radix_tree_root *root = &sbi->extent_tree_root; unsigned int found; unsigned int node_cnt = 0, tree_cnt = 0; + int remained; if (!test_opt(sbi, EXTENT_CACHE)) return 0; + if (!down_write_trylock(&sbi->extent_tree_lock)) + goto out; + + /* 1. remove unreferenced extent tree */ + while ((found = radix_tree_gang_lookup(root, + (void **)treevec, ino, EXT_TREE_VEC_SIZE))) { + unsigned i; + + ino = treevec[found - 1]->ino + 1; + for (i = 0; i < found; i++) { + struct extent_tree *et = treevec[i]; + + if (!atomic_read(&et->refcount)) { + write_lock(&et->lock); + node_cnt += __free_extent_tree(sbi, et, true); + write_unlock(&et->lock); + + radix_tree_delete(root, et->ino); + kmem_cache_free(extent_tree_slab, et); + sbi->total_ext_tree--; + tree_cnt++; + + if (node_cnt + tree_cnt >= nr_shrink) + goto unlock_out; + } + } + } + up_write(&sbi->extent_tree_lock); + + /* 2. remove LRU extent entries */ + if (!down_write_trylock(&sbi->extent_tree_lock)) + goto out; + + remained = nr_shrink - (node_cnt + tree_cnt); + spin_lock(&sbi->extent_lock); list_for_each_entry_safe(en, tmp, &sbi->extent_list, list) { - if (!nr_shrink--) + if (!remained--) break; list_del_init(&en->list); } spin_unlock(&sbi->extent_lock); - if (!down_write_trylock(&sbi->extent_tree_lock)) - goto out; - while ((found = radix_tree_gang_lookup(root, (void **)treevec, ino, EXT_TREE_VEC_SIZE))) { unsigned i; @@ -687,14 +720,12 @@ unsigned int f2fs_shrink_extent_tree(struct f2fs_sb_info *sbi, int nr_shrink) write_lock(&et->lock); node_cnt += __free_extent_tree(sbi, et, false); write_unlock(&et->lock); - if (!atomic_read(&et->refcount) && !et->count) { - radix_tree_delete(root, et->ino); - kmem_cache_free(extent_tree_slab, et); - sbi->total_ext_tree--; - tree_cnt++; - } + + if (node_cnt + tree_cnt >= nr_shrink) + break; } } +unlock_out: up_write(&sbi->extent_tree_lock); out: trace_f2fs_shrink_extent_tree(sbi, node_cnt, tree_cnt); -- 2.1.1
WARNING: multiple messages have this Message-ID (diff)
From: Jaegeuk Kim <jaegeuk@kernel.org> To: linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net Cc: Jaegeuk Kim <jaegeuk@kernel.org> Subject: [PATCH 2/2] f2fs: shrink unreferenced extent_caches first Date: Tue, 30 Jun 2015 18:25:46 -0700 [thread overview] Message-ID: <1435713946-6910-2-git-send-email-jaegeuk@kernel.org> (raw) In-Reply-To: <1435713946-6910-1-git-send-email-jaegeuk@kernel.org> If an extent_tree entry has a zero reference count, we can drop it from the cache in higher priority rather than currently referencing entries. Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org> --- fs/f2fs/data.c | 51 +++++++++++++++++++++++++++++++++++++++++---------- 1 file changed, 41 insertions(+), 10 deletions(-) diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c index 8f059e0..a0a0e2b 100644 --- a/fs/f2fs/data.c +++ b/fs/f2fs/data.c @@ -661,21 +661,54 @@ unsigned int f2fs_shrink_extent_tree(struct f2fs_sb_info *sbi, int nr_shrink) struct radix_tree_root *root = &sbi->extent_tree_root; unsigned int found; unsigned int node_cnt = 0, tree_cnt = 0; + int remained; if (!test_opt(sbi, EXTENT_CACHE)) return 0; + if (!down_write_trylock(&sbi->extent_tree_lock)) + goto out; + + /* 1. remove unreferenced extent tree */ + while ((found = radix_tree_gang_lookup(root, + (void **)treevec, ino, EXT_TREE_VEC_SIZE))) { + unsigned i; + + ino = treevec[found - 1]->ino + 1; + for (i = 0; i < found; i++) { + struct extent_tree *et = treevec[i]; + + if (!atomic_read(&et->refcount)) { + write_lock(&et->lock); + node_cnt += __free_extent_tree(sbi, et, true); + write_unlock(&et->lock); + + radix_tree_delete(root, et->ino); + kmem_cache_free(extent_tree_slab, et); + sbi->total_ext_tree--; + tree_cnt++; + + if (node_cnt + tree_cnt >= nr_shrink) + goto unlock_out; + } + } + } + up_write(&sbi->extent_tree_lock); + + /* 2. remove LRU extent entries */ + if (!down_write_trylock(&sbi->extent_tree_lock)) + goto out; + + remained = nr_shrink - (node_cnt + tree_cnt); + spin_lock(&sbi->extent_lock); list_for_each_entry_safe(en, tmp, &sbi->extent_list, list) { - if (!nr_shrink--) + if (!remained--) break; list_del_init(&en->list); } spin_unlock(&sbi->extent_lock); - if (!down_write_trylock(&sbi->extent_tree_lock)) - goto out; - while ((found = radix_tree_gang_lookup(root, (void **)treevec, ino, EXT_TREE_VEC_SIZE))) { unsigned i; @@ -687,14 +720,12 @@ unsigned int f2fs_shrink_extent_tree(struct f2fs_sb_info *sbi, int nr_shrink) write_lock(&et->lock); node_cnt += __free_extent_tree(sbi, et, false); write_unlock(&et->lock); - if (!atomic_read(&et->refcount) && !et->count) { - radix_tree_delete(root, et->ino); - kmem_cache_free(extent_tree_slab, et); - sbi->total_ext_tree--; - tree_cnt++; - } + + if (node_cnt + tree_cnt >= nr_shrink) + break; } } +unlock_out: up_write(&sbi->extent_tree_lock); out: trace_f2fs_shrink_extent_tree(sbi, node_cnt, tree_cnt); -- 2.1.1 ------------------------------------------------------------------------------ Don't Limit Your Business. Reach for the Cloud. GigeNET's Cloud Solutions provide you with the tools and support that you need to offload your IT needs and focus on growing your business. Configured For All Businesses. Start Your Cloud Today. https://www.gigenetcloud.com/
next prev parent reply other threads:[~2015-07-01 1:26 UTC|newest] Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top 2015-07-01 1:25 [PATCH 1/2] f2fs: check the largest extent at look-up time Jaegeuk Kim 2015-07-01 1:25 ` Jaegeuk Kim 2015-07-01 1:25 ` Jaegeuk Kim [this message] 2015-07-01 1:25 ` [PATCH 2/2] f2fs: shrink unreferenced extent_caches first Jaegeuk Kim 2015-07-02 12:39 ` [f2fs-dev] " Chao Yu 2015-07-02 12:39 ` Chao Yu 2015-07-04 6:29 ` Jaegeuk Kim 2015-07-06 12:25 ` Chao Yu 2015-07-06 22:16 ` Jaegeuk Kim 2015-07-08 9:41 ` Chao Yu 2015-07-10 23:54 ` Jaegeuk Kim 2015-07-10 23:54 ` Jaegeuk Kim 2015-07-11 1:53 ` [f2fs-dev] " Chao Yu 2015-07-11 1:53 ` Chao Yu 2015-07-02 12:38 ` [f2fs-dev] [PATCH 1/2] f2fs: check the largest extent at look-up time Chao Yu 2015-07-02 12:38 ` Chao Yu
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