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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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7
kernel/exit.c
View file

@ -137,12 +137,8 @@ void release_task(struct task_struct * p)
{
int zap_leader;
task_t *leader;
struct dentry *proc_dentry;
repeat:
atomic_dec(&p->user->processes);
spin_lock(&p->proc_lock);
proc_dentry = proc_pid_unhash(p);
write_lock_irq(&tasklist_lock);
ptrace_unlink(p);
BUG_ON(!list_empty(&p->ptrace_list) || !list_empty(&p->ptrace_children));
@ -171,8 +167,7 @@ repeat:
sched_exit(p);
write_unlock_irq(&tasklist_lock);
spin_unlock(&p->proc_lock);
proc_pid_flush(proc_dentry);
proc_flush_task(p);
release_thread(p);
call_rcu(&p->rcu, delayed_put_task_struct);