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mm: clean up and kernelify shrinker registration

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I can never remember what the function to register to receive VM pressure
is called.  I have to trace down from __alloc_pages() to find it.

It's called "set_shrinker()", and it needs Your Help.

1) Don't hide struct shrinker.  It contains no magic.
2) Don't allocate "struct shrinker".  It's not helpful.
3) Call them "register_shrinker" and "unregister_shrinker".
4) Call the function "shrink" not "shrinker".
5) Reduce the 17 lines of waffly comments to 13, but document it properly.

Signed-off-by: Rusty Russell <[email protected]>
Cc: David Chinner <[email protected]>
Cc: Trond Myklebust <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Rusty Russell 2007-07-17 04:03:17 -07:00 • committed by Linus Torvalds
commit 8e1f936b73
10 changed files with 81 additions and 74 deletions
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7
fs/inode.c
View file

@ -462,6 +462,11 @@ static int shrink_icache_memory(int nr, gfp_t gfp_mask)
return (inodes_stat.nr_unused / 100) * sysctl_vfs_cache_pressure;
}
static struct shrinker icache_shrinker = {
.shrink = shrink_icache_memory,
.seeks = DEFAULT_SEEKS,
};
static void __wait_on_freeing_inode(struct inode *inode);
/*
* Called with the inode lock held.
@ -1385,7 +1390,7 @@ void __init inode_init(unsigned long mempages)
SLAB_MEM_SPREAD),
init_once,
NULL);
set_shrinker(DEFAULT_SEEKS, shrink_icache_memory);
register_shrinker(&icache_shrinker);
/* Hash may have been set up in inode_init_early */
if (!hashdist)