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>
diff --git a/init/Kconfig b/init/Kconfig
index 14c483d..92d4106 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -597,6 +597,8 @@
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
diff --git a/mm/page_cgroup.c b/mm/page_cgroup.c
index ebf8107..791905c 100644
--- a/mm/page_cgroup.c
+++ b/mm/page_cgroup.c
@@ -426,13 +426,6 @@
}
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");