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[PATCH] proc: Rewrite the proc dentry flush on exit optimization

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To keep the dcache from filling up with dead /proc entries we flush them on
process exit.  However over the years that code has gotten hairy with a
dentry_pointer and a lock in task_struct and misdocumented as a correctness
feature.

I have rewritten this code to look and see if we have a corresponding entry in
the dcache and if so flush it on process exit.  This removes the extra fields
in the task_struct and allows me to trivially handle the case of a
/proc/<tgid>/task/<pid> entry as well as the current /proc/<pid> entries.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Eric W. Biederman
2006-06-26 00:25:48 -07:00
committed by Linus Torvalds
parent 662795deb8
commit 48e6484d49
7 changed files with 65 additions and 101 deletions
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3
include/linux/sched.h
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@ -842,8 +842,6 @@ struct task_struct {
u32 self_exec_id;
/* Protection of (de-)allocation: mm, files, fs, tty, keyrings */
spinlock_t alloc_lock;
/* Protection of proc_dentry: nesting proc_lock, dcache_lock, write_lock_irq(&tasklist_lock); */
spinlock_t proc_lock;
#ifdef CONFIG_DEBUG_MUTEXES
/* mutex deadlock detection */
@ -856,7 +854,6 @@ struct task_struct {
/* VM state */
struct reclaim_state *reclaim_state;
struct dentry *proc_dentry;
struct backing_dev_info *backing_dev_info;
struct io_context *io_context;