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From: Nicholas Piggin <npiggin@gmail.com>
To: linux-kernel@vger.kernel.org
Cc: Nicholas Piggin <npiggin@gmail.com>,
	linux-arch@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
	linux-mm@kvack.org, Anton Blanchard <anton@ozlabs.org>,
	Andy Lutomirski <luto@kernel.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


WARNING: multiple messages have this Message-ID (diff)
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


  parent reply	other threads:[~2020-12-14  7:03 UTC|newest]

Thread overview: 16+ 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 ` 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   ` 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   ` 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  6:53   ` Nicholas Piggin
2020-12-14  7:04   ` Randy Dunlap
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
2020-12-14  6:53 ` Nicholas Piggin [this message]
2020-12-14  6:53   ` [PATCH v2 5/5] powerpc/64s: enable MMU_LAZY_TLB_SHOOTDOWN Nicholas Piggin
2021-02-04  8:21 ` [PATCH v2 0/5] shoot lazy tlbs Nicholas Piggin
2021-02-04  8:21   ` Nicholas Piggin

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