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memcg: remove redundant message at swapon 

It's pointed out that swap_cgroup's message at swapon() is nonsense.
Because

  * It can be calculated very easily if all necessary information is
    written in Kconfig.

  * It's not necessary to annoying people at every swapon().

In other view, now, memory usage per swp_entry is reduced to 2bytes from
8bytes(64bit) and I think it's reasonably small.

Reported-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
KAMEZAWA Hiroyuki 2009-04-02 16:57:47 -07:00 committed by Linus Torvalds
parent a3b2d69269
commit 627991a20b
2 changed files with 2 additions and 7 deletions
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2
init/Kconfig
View File

@ -597,6 +597,8 @@ config CGROUP_MEM_RES_CTLR_SWAP
is disabled by boot option, this will be automatically disabled and
there will be no overhead from this. Even when you set this config=y,
if boot option "noswapaccount" is set, swap will not be accounted.
Now, memory usage of swap_cgroup is 2 bytes per entry. If swap page
size is 4096bytes, 512k per 1Gbytes of swap.
endif # CGROUPS

7
mm/page_cgroup.c
View File

@ -426,13 +426,6 @@ int swap_cgroup_swapon(int type, unsigned long max_pages)
}
mutex_unlock(&swap_cgroup_mutex);
printk(KERN_INFO
"swap_cgroup: uses %ld bytes of vmalloc for pointer array space"
" and %ld bytes to hold mem_cgroup information per swap ents\n",
array_size, length * PAGE_SIZE);
printk(KERN_INFO
"swap_cgroup can be disabled by noswapaccount boot option.\n");
return 0;
nomem:
printk(KERN_INFO "couldn't allocate enough memory for swap_cgroup.\n");