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coredump: kill mm->core_done

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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>
This commit is contained in:
Oleg Nesterov 2008-07-25 01:47:46 -07:00 • committed by Linus Torvalds
parent 182c515fd2
commit a94e2d408e
3 changed files with 30 additions and 7 deletions
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8
kernel/exit.c
View file

@ -691,7 +691,13 @@ static void exit_mm(struct task_struct * tsk)
if (atomic_dec_and_test(&core_state->nr_threads))
complete(&core_state->startup);
wait_for_completion(&mm->core_done);
for (;;) {
set_task_state(tsk, TASK_UNINTERRUPTIBLE);
if (!self.task) /* see coredump_finish() */
break;
schedule();
}
__set_task_state(tsk, TASK_RUNNING);
down_read(&mm->mmap_sem);
}
atomic_inc(&mm->mm_count);