From: Nicholas Piggin <npiggin@gmail.com>
To: linux-kernel@vger.kernel.org
Cc: linux-arch@vger.kernel.org, Nicholas Piggin <npiggin@gmail.com>,
linux-mm@kvack.org, Andy Lutomirski <luto@kernel.org>,
linuxppc-dev@lists.ozlabs.org
Subject: [PATCH v2 5/5] powerpc/64s: enable MMU_LAZY_TLB_SHOOTDOWN
Date: Mon, 14 Dec 2020 16:53:12 +1000 [thread overview]
Message-ID: <20201214065312.270062-6-npiggin@gmail.com> (raw)
In-Reply-To: <20201214065312.270062-1-npiggin@gmail.com>
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.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
---
arch/powerpc/Kconfig | 1 +
1 file changed, 1 insertion(+)
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 5181872f9452..356138bdb5bb 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -232,6 +232,7 @@ config PPC
select HAVE_PERF_USER_STACK_DUMP
select MMU_GATHER_RCU_TABLE_FREE
select MMU_GATHER_PAGE_SIZE
+ select MMU_LAZY_TLB_SHOOTDOWN if PPC_BOOK3S_64
select HAVE_REGS_AND_STACK_ACCESS_API
select HAVE_RELIABLE_STACKTRACE if PPC_BOOK3S_64 && CPU_LITTLE_ENDIAN
select HAVE_SYSCALL_TRACEPOINTS
--
2.23.0
next prev parent reply other threads:[~2020-12-14 7:10 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-14 6:53 [PATCH v2 0/5] shoot lazy tlbs Nicholas Piggin
2020-12-14 6:53 ` [PATCH v2 1/5] lazy tlb: introduce lazy mm refcount helper functions Nicholas Piggin
2020-12-14 6:53 ` [PATCH v2 2/5] lazy tlb: allow lazy tlb mm switching to be configurable Nicholas Piggin
2020-12-14 6:53 ` [PATCH v2 3/5] lazy tlb: shoot lazies, a non-refcounting lazy tlb option Nicholas Piggin
2020-12-14 7:04 ` Randy Dunlap
2020-12-14 6:53 ` [PATCH v2 4/5] powerpc: use lazy mm refcount helper functions Nicholas Piggin
2020-12-14 6:53 ` Nicholas Piggin [this message]
2021-02-04 8:21 ` [PATCH v2 0/5] shoot lazy tlbs Nicholas Piggin
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