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authorOleg Nesterov <oleg@tv-sign.ru>2008-07-25 01:47:46 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-07-25 10:53:40 -0700
commita94e2d408eaedbd85aae259621d46fafc10479a2 (patch)
treed853f7b2e183875c6ad90fb6ab38e084b037d043 /fs
parent182c515fd2a942623aed4e4e0e0b37fe96571b05 (diff)
downloadlinux-2.6.34-ux500-a94e2d408eaedbd85aae259621d46fafc10479a2.tar.gz
coredump: kill mm->core_done
Now that we have core_state->dumper list we can use it to wake up the sub-threads waiting for the coredump completion. This uglifies the code and .text grows by 47 bytes, but otoh mm_struct lessens by sizeof(struct completion). Also, with this change we can decouple exit_mm() from the coredumping code. Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru> Cc: Roland McGrath <roland@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs')
-rw-r--r--fs/exec.c25
1 files changed, 22 insertions, 3 deletions
diff --git a/fs/exec.c b/fs/exec.c
index fe2873b8037..bff43aeb235 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -1602,7 +1602,6 @@ static int coredump_wait(int exit_code, struct core_state *core_state)
struct completion *vfork_done;
int core_waiters;
- init_completion(&mm->core_done);
init_completion(&core_state->startup);
core_state->dumper.task = tsk;
core_state->dumper.next = NULL;
@@ -1628,6 +1627,27 @@ fail:
return core_waiters;
}
+static void coredump_finish(struct mm_struct *mm)
+{
+ struct core_thread *curr, *next;
+ struct task_struct *task;
+
+ next = mm->core_state->dumper.next;
+ while ((curr = next) != NULL) {
+ next = curr->next;
+ task = curr->task;
+ /*
+ * see exit_mm(), curr->task must not see
+ * ->task == NULL before we read ->next.
+ */
+ smp_mb();
+ curr->task = NULL;
+ wake_up_process(task);
+ }
+
+ mm->core_state = NULL;
+}
+
/*
* set_dumpable converts traditional three-value dumpable to two flags and
* stores them into mm->flags. It modifies lower two bits of mm->flags, but
@@ -1812,8 +1832,7 @@ fail_unlock:
argv_free(helper_argv);
current->fsuid = fsuid;
- complete_all(&mm->core_done);
- mm->core_state = NULL;
+ coredump_finish(mm);
fail:
return retval;
}