linux-kernel - Re: [PATCH v4 4/4] powerpc/64s: enable MMU_LAZY_TLB

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Message-Id: <20210607165241.4dcd4cf63f96437c5650d179@linux-foundation.org>
Date:   Mon, 7 Jun 2021 16:52:41 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Nicholas Piggin <npiggin@...il.com>
Cc:     Randy Dunlap <rdunlap@...radead.org>, linux-kernel@...r.kernel.org,
        linux-arch@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        linux-mm@...ck.org, Anton Blanchard <anton@...abs.org>,
        Andy Lutomirski <luto@...nel.org>
Subject: Re: [PATCH v4 4/4] powerpc/64s: enable MMU_LAZY_TLB_SHOOTDOWN

On Sat,  5 Jun 2021 11:42:16 +1000 Nicholas Piggin <npiggin@...il.com> wrote:

> On a 16-socket 192-core POWER8 system, a context switching benchmark
> with as many software threads as CPUs (so each switch will go in and
> out of idle), upstream can achieve a rate of about 1 million context
> switches per second. After this patch it goes up to 118 million.

Nice.  Do we have a feel for the benefit on any real-world workloads?

Could any other architectures benefit from these changes?