Ian Kent writes:
> On Fri, 2017-05-12 at 00:08 -0700, Andrei Vagin wrote:
>> With this patch, we don't try to umount all mounts of a tree together.
>> Instead of this we umount them one by one. In this case, we see a significant
>> improvement in performance for the worsе case.
>
> Indeed, umount
On Fri, 2017-05-12 at 00:08 -0700, Andrei Vagin wrote:
> With this patch, we don't try to umount all mounts of a tree together.
> Instead of this we umount them one by one. In this case, we see a significant
> improvement in performance for the worsе case.
Indeed, umount has been very slow for a w
With this patch, we don't try to umount all mounts of a tree together.
Instead of this we umount them one by one. In this case, we see a significant
improvement in performance for the worsе case.
The reason of this optimization is that umount() can hold namespace_sem
for a long time, this semaphor
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