I have noticed that struct dentry_stat_t dentry_stat is a struct with six fields, but only 2 of them are used, other 4 have never been used since v2.6.11, from include/linux/dcache.h: struct dentry_stat_t { int nr_dentry; int nr_unused; int age_limit; /* age in seconds */ int want_pages; /* pages requested by system */ int dummy[2]; }; extern struct dentry_stat_t dentry_stat; (I don't know things before v2.6.11, my local linux-2.6.git repository can only grep to v2.6.11) $ PAGER= git grep -w -e dentry_stat Documentation/sysctl/fs.txt:} dentry_stat = {0, 0, 45, 0,}; fs/dcache.c:struct dentry_stat_t dentry_stat = { fs/dcache.c: * no dcache_lock, please. The caller must decrement dentry_stat.nr_dentry fs/dcache.c: dentry_stat.nr_unused--; fs/dcache.c: dentry_stat.nr_dentry--; /* For d_free, below */ fs/dcache.c: dentry_stat.nr_unused++; fs/dcache.c: dentry_stat.nr_unused--; fs/dcache.c: dentry_stat.nr_unused++; fs/dcache.c: dentry_stat.nr_unused++; fs/dcache.c: dentry_stat.nr_unused--; fs/dcache.c: dentry_stat.nr_dentry -= detached; fs/dcache.c: dentry_stat.nr_unused++; fs/dcache.c: return (dentry_stat.nr_unused / 100) * sysctl_vfs_cache_pressure; fs/dcache.c: dentry_stat.nr_dentry++; include/linux/dcache.h:extern struct dentry_stat_t dentry_stat; kernel/sysctl.c: .data = &dentry_stat, it's the same as that of v2.6.11: $ PAGER= git grep -w -e dentry_stat v2.6.11 -- v2.6.11:Documentation/sysctl/fs.txt:} dentry_stat = {0, 0, 45, 0,}; v2.6.11:fs/dcache.c:struct dentry_stat_t dentry_stat = { v2.6.11:fs/dcache.c: * no dcache_lock, please. The caller must decrement dentry_stat.nr_dentry v2.6.11:fs/dcache.c: dentry_stat.nr_unused++; v2.6.11:fs/dcache.c: dentry_stat.nr_unused--; v2.6.11:fs/dcache.c: dentry_stat.nr_dentry--; /* For d_free, below */ v2.6.11:fs/dcache.c: dentry_stat.nr_unused--; v2.6.11:fs/dcache.c: dentry_stat.nr_dentry--; /* For d_free, below */ v2.6.11:fs/dcache.c: dentry_stat.nr_unused--; v2.6.11:fs/dcache.c: dentry_stat.nr_unused++; v2.6.11:fs/dcache.c: dentry_stat.nr_unused--; v2.6.11:fs/dcache.c: dentry_stat.nr_unused--; v2.6.11:fs/dcache.c: dentry_stat.nr_unused++; v2.6.11:fs/dcache.c: dentry_stat.nr_unused--; v2.6.11:fs/dcache.c: dentry_stat.nr_unused++; v2.6.11:fs/dcache.c: return (dentry_stat.nr_unused / 100) * sysctl_vfs_cache_pressure; v2.6.11:fs/dcache.c: dentry_stat.nr_dentry++; v2.6.11:include/linux/dcache.h:extern struct dentry_stat_t dentry_stat; v2.6.11:kernel/sysctl.c: .data = &dentry_stat, So I think that struct is outdated and can be simplified. -- Cheng -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html