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SubjectRe: [PATCH v2] mm: correctly synchronize rss-counters at exit/exec
On 04/10, Konstantin Khlebnikov wrote:
>
> This patch moves sync_mm_rss() into mm_release(), and moves mm_release() out of
> do_exit() and calls it earlier. After mm_release() there should be no page-faults.

Can't prove, but I feel there should be a simpler fix...

Anyway, this patch is not exactly correct.

> @@ -959,9 +959,10 @@ void do_exit(long code)
> preempt_count());
>
> acct_update_integrals(tsk);
> - /* sync mm's RSS info before statistics gathering */
> - if (tsk->mm)
> - sync_mm_rss(tsk->mm);
> +
> + /* Release mm and sync mm's RSS info before statistics gathering */
> + mm_release(tsk, tsk->mm);

This breaks kthread_stop() at least.

The exiting kthread shouldn't do complete_vfork_done() until it
sets ->exit_code.

Oleg.



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