On Fri, Oct 05 2018, NeilBrown wrote:
> The synchronize_rcu() in namespace_unlock() is called every time
> a filesystem is unmounted. If a great many filesystems are mounted,
> this can cause a noticable slow-down in, for example, system shutdown.
>
> The sequence:
> mkdir -p /tmp/Mtest/{0..500
On Fri, Oct 05, 2018 at 02:40:02AM +0100, Al Viro wrote:
> On Fri, Oct 05, 2018 at 11:27:37AM +1000, NeilBrown wrote:
> >
> > The synchronize_rcu() in namespace_unlock() is called every time
> > a filesystem is unmounted. If a great many filesystems are mounted,
> > this can cause a noticable slo
On Fri, Oct 05 2018, Al Viro wrote:
> On Fri, Oct 05, 2018 at 11:27:37AM +1000, NeilBrown wrote:
>>
>> The synchronize_rcu() in namespace_unlock() is called every time
>> a filesystem is unmounted. If a great many filesystems are mounted,
>> this can cause a noticable slow-down in, for example,
On Fri, Oct 05, 2018 at 11:27:37AM +1000, NeilBrown wrote:
>
> The synchronize_rcu() in namespace_unlock() is called every time
> a filesystem is unmounted. If a great many filesystems are mounted,
> this can cause a noticable slow-down in, for example, system shutdown.
>
> The sequence:
> mkd
The synchronize_rcu() in namespace_unlock() is called every time
a filesystem is unmounted. If a great many filesystems are mounted,
this can cause a noticable slow-down in, for example, system shutdown.
The sequence:
mkdir -p /tmp/Mtest/{0..5000}
time for i in /tmp/Mtest/*; do mount -t tmpf
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