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f2fs: control not to exceed # of cached nat entries

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This is to avoid cache entry management overhead including radix tree.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Jaegeuk Kim
2016-06-02 15:24:24 -07:00
parent 29710bcf94
commit e589c2c477
3 changed files with 16 additions and 0 deletions
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fs/f2fs/node.c
+4
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@@ -52,6 +52,10 @@ bool available_free_memory(struct f2fs_sb_info *sbi, int type)
mem_size = (nm_i->nat_cnt * sizeof(struct nat_entry)) >>
PAGE_SHIFT;
res = mem_size < ((avail_ram * nm_i->ram_thresh / 100) >> 2);
if (excess_cached_nats(sbi))
res = false;
if (nm_i->nat_cnt > DEF_NAT_CACHE_THRESHOLD)
res = false;
} else if (type == DIRTY_DENTS) {
if (sbi->sb->s_bdi->wb.dirty_exceeded)
return false;