Re: [linus:master] [mm] f95bdb700b: stress-ng.ramfs.ops_per_sec -88.8% regression

[Qi Zheng]

Hi,

On 2023/5/29 20:51, Paul E. McKenney wrote:
> On Mon, May 29, 2023 at 10:39:21AM +0800, Qi Zheng wrote:

[...]

> > Thanks for such a detailed explanation.
> >
> > Now I think we can continue to try to complete the idea[1] from
> > Kirill Tkhai. The patch moves heavy synchronize_srcu() to delayed
> > work, so it doesn't affect on user-visible unregistration speed.
> >
> > [1]. https://lore.kernel.org/lkml/153365636747.19074.12610817307548583381.stgit@localhost.localdomain/
>
> A blast from the past!  ;-)
>
> But yes, moving the long-latency synchronize_srcu() off the user-visible
> critical code path can be even better.

Yeah, I applied these patches  ([PATCH RFC 04/10]~[PATCH RFC 10/10],
with few conflicts), the ops/s does get back to the previous levels.

I'll continue updating this patchset after doing more testing.

Thanks,
Qi

> 							Thanx, Paul