linux-kernel - [PATCH 3/5] f2fs: control the memory footprint used by ino entries

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Message-Id: <1415518569-20626-3-git-send-email-jaegeuk@kernel.org>
Date:	Sat,  8 Nov 2014 23:36:07 -0800
From:	Jaegeuk Kim <jaegeuk@...nel.org>
To:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	linux-f2fs-devel@...ts.sourceforge.net
Cc:	Jaegeuk Kim <jaegeuk@...nel.org>
Subject: [PATCH 3/5] f2fs: control the memory footprint used by ino entries

This patch adds to control the memory footprint used by ino entries.
This will conduct best effort, not strictly.

Signed-off-by: Jaegeuk Kim <jaegeuk@...nel.org>
---
 fs/f2fs/node.c    | 28 ++++++++++++++++++++++------
 fs/f2fs/node.h    |  3 ++-
 fs/f2fs/segment.c |  3 ++-
 3 files changed, 26 insertions(+), 8 deletions(-)

diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
index 44b8afe..4ea2c47 100644
--- a/fs/f2fs/node.c
+++ b/fs/f2fs/node.c
@@ -31,22 +31,38 @@ bool available_free_memory(struct f2fs_sb_info *sbi, int type)
 {
 	struct f2fs_nm_info *nm_i = NM_I(sbi);
 	struct sysinfo val;
+	unsigned long avail_ram;
 	unsigned long mem_size = 0;
 	bool res = false;
 
 	si_meminfo(&val);
-	/* give 25%, 25%, 50% memory for each components respectively */
+
+	/* only uses low memory */
+	avail_ram = val.totalram - val.totalhigh;
+
+	/* give 25%, 25%, 50%, 50% memory for each components respectively */
 	if (type == FREE_NIDS) {
-		mem_size = (nm_i->fcnt * sizeof(struct free_nid)) >> 12;
-		res = mem_size < ((val.totalram * nm_i->ram_thresh / 100) >> 2);
+		mem_size = (nm_i->fcnt * sizeof(struct free_nid)) >>
+							PAGE_CACHE_SHIFT;
+		res = mem_size < ((avail_ram * nm_i->ram_thresh / 100) >> 2);
 	} else if (type == NAT_ENTRIES) {
-		mem_size = (nm_i->nat_cnt * sizeof(struct nat_entry)) >> 12;
-		res = mem_size < ((val.totalram * nm_i->ram_thresh / 100) >> 2);
+		mem_size = (nm_i->nat_cnt * sizeof(struct nat_entry)) >>
+							PAGE_CACHE_SHIFT;
+		res = mem_size < ((avail_ram * nm_i->ram_thresh / 100) >> 2);
 	} else if (type == DIRTY_DENTS) {
 		if (sbi->sb->s_bdi->dirty_exceeded)
 			return false;
 		mem_size = get_pages(sbi, F2FS_DIRTY_DENTS);
-		res = mem_size < ((val.totalram * nm_i->ram_thresh / 100) >> 1);
+		res = mem_size < ((avail_ram * nm_i->ram_thresh / 100) >> 1);
+	} else if (type == INO_ENTRIES) {
+		int i;
+
+		if (sbi->sb->s_bdi->dirty_exceeded)
+			return false;
+		for (i = 0; i <= UPDATE_INO; i++)
+			mem_size += (sbi->ino_num[i] * sizeof(struct ino_entry))
+							>> PAGE_CACHE_SHIFT;
+		res = mem_size < ((avail_ram * nm_i->ram_thresh / 100) >> 1);
 	}
 	return res;
 }
diff --git a/fs/f2fs/node.h b/fs/f2fs/node.h
index acb71e5..d10b644 100644
--- a/fs/f2fs/node.h
+++ b/fs/f2fs/node.h
@@ -106,7 +106,8 @@ static inline void raw_nat_from_node_info(struct f2fs_nat_entry *raw_ne,
 enum mem_type {
 	FREE_NIDS,	/* indicates the free nid list */
 	NAT_ENTRIES,	/* indicates the cached nat entry */
-	DIRTY_DENTS	/* indicates dirty dentry pages */
+	DIRTY_DENTS,	/* indicates dirty dentry pages */
+	INO_ENTRIES,	/* indicates inode entries */
 };
 
 struct nat_entry_set {
diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 16721b5d..e094675 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -276,7 +276,8 @@ void f2fs_balance_fs_bg(struct f2fs_sb_info *sbi)
 {
 	/* check the # of cached NAT entries and prefree segments */
 	if (try_to_free_nats(sbi, NAT_ENTRY_PER_BLOCK) ||
-				excess_prefree_segs(sbi))
+			excess_prefree_segs(sbi) ||
+			available_free_memory(sbi, INO_ENTRIES))
 		f2fs_sync_fs(sbi->sb, true);
 }
 
-- 
2.1.1

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