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authorEric W. Biederman <ebiederm@xmission.com>2006-06-26 00:25:55 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-06-26 09:58:25 -0700
commit99f895518368252ba862cc15ce4eb98ebbe1bec6 (patch)
treea9dcc01963221d1fd6a7e357b95d361ebfe91c6d /fs/proc/inode.c
parent8578cea7509cbdec25b31d08b48a92fcc3b1a9e3 (diff)
[PATCH] proc: don't lock task_structs indefinitely
Every inode in /proc holds a reference to a struct task_struct. If a directory or file is opened and remains open after the the task exits this pinning continues. With 8K stacks on a 32bit machine the amount pinned per file descriptor is about 10K. Normally I would figure a reasonable per user process limit is about 100 processes. With 80 processes, with a 1000 file descriptors each I can trigger the 00M killer on a 32bit kernel, because I have pinned about 800MB of useless data. This patch replaces the struct task_struct pointer with a pointer to a struct task_ref which has a struct task_struct pointer. The so the pinning of dead tasks does not happen. The code now has to contend with the fact that the task may now exit at any time. Which is a little but not muh more complicated. With this change it takes about 1000 processes each opening up 1000 file descriptors before I can trigger the OOM killer. Much better. [mlp@google.com: task_mmu small fixes] Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Cc: Trond Myklebust <trond.myklebust@fys.uio.no> Cc: Paul Jackson <pj@sgi.com> Cc: Oleg Nesterov <oleg@tv-sign.ru> Cc: Albert Cahalan <acahalan@gmail.com> Signed-off-by: Prasanna Meda <mlp@google.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'fs/proc/inode.c')
-rw-r--r--fs/proc/inode.c9
1 files changed, 3 insertions, 6 deletions
diff --git a/fs/proc/inode.c b/fs/proc/inode.c
index fbc94df138a7..31e0475c6cb9 100644
--- a/fs/proc/inode.c
+++ b/fs/proc/inode.c
@@ -58,14 +58,11 @@ static void de_put(struct proc_dir_entry *de)
static void proc_delete_inode(struct inode *inode)
{
struct proc_dir_entry *de;
- struct task_struct *tsk;
truncate_inode_pages(&inode->i_data, 0);
- /* Let go of any associated process */
- tsk = PROC_I(inode)->task;
- if (tsk)
- put_task_struct(tsk);
+ /* Stop tracking associated processes */
+ tref_put(PROC_I(inode)->tref);
/* Let go of any associated proc directory entry */
de = PROC_I(inode)->pde;
@@ -94,7 +91,7 @@ static struct inode *proc_alloc_inode(struct super_block *sb)
ei = (struct proc_inode *)kmem_cache_alloc(proc_inode_cachep, SLAB_KERNEL);
if (!ei)
return NULL;
- ei->task = NULL;
+ ei->tref = NULL;
ei->fd = 0;
ei->op.proc_get_link = NULL;
ei->pde = NULL;