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From: Nicholas Piggin <npiggin@gmail.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Nicholas Piggin <npiggin@gmail.com>,
	Randy Dunlap <rdunlap@infradead.org>,
	linux-kernel@vger.kernel.org, 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 v4 4/4] powerpc/64s: enable MMU_LAZY_TLB_SHOOTDOWN
Date: Sat,  5 Jun 2021 11:42:16 +1000	[thread overview]
Message-ID: <20210605014216.446867-5-npiggin@gmail.com> (raw)
In-Reply-To: <20210605014216.446867-1-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 088dd2afcfe4..8a092eedc692 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -252,6 +252,7 @@ config PPC
 	select IRQ_FORCED_THREADING
 	select MMU_GATHER_PAGE_SIZE
 	select MMU_GATHER_RCU_TABLE_FREE
+	select MMU_LAZY_TLB_SHOOTDOWN		if PPC_BOOK3S_64
 	select MODULES_USE_ELF_RELA
 	select NEED_DMA_MAP_STATE		if PPC64 || NOT_COHERENT_CACHE
 	select NEED_SG_DMA_LENGTH
-- 
2.23.0


WARNING: multiple messages have this Message-ID (diff)
From: Nicholas Piggin <npiggin@gmail.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: linux-arch@vger.kernel.org, Randy Dunlap <rdunlap@infradead.org>,
	linux-kernel@vger.kernel.org, Nicholas Piggin <npiggin@gmail.com>,
	linux-mm@kvack.org, Andy Lutomirski <luto@kernel.org>,
	linuxppc-dev@lists.ozlabs.org
Subject: [PATCH v4 4/4] powerpc/64s: enable MMU_LAZY_TLB_SHOOTDOWN
Date: Sat,  5 Jun 2021 11:42:16 +1000	[thread overview]
Message-ID: <20210605014216.446867-5-npiggin@gmail.com> (raw)
In-Reply-To: <20210605014216.446867-1-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 088dd2afcfe4..8a092eedc692 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -252,6 +252,7 @@ config PPC
 	select IRQ_FORCED_THREADING
 	select MMU_GATHER_PAGE_SIZE
 	select MMU_GATHER_RCU_TABLE_FREE
+	select MMU_LAZY_TLB_SHOOTDOWN		if PPC_BOOK3S_64
 	select MODULES_USE_ELF_RELA
 	select NEED_DMA_MAP_STATE		if PPC64 || NOT_COHERENT_CACHE
 	select NEED_SG_DMA_LENGTH
-- 
2.23.0


  parent reply	other threads:[~2021-06-05  1:43 UTC|newest]

Thread overview: 48+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-05  1:42 [PATCH v4 0/4] shoot lazy tlbs Nicholas Piggin
2021-06-05  1:42 ` Nicholas Piggin
2021-06-05  1:42 ` [PATCH v4 1/4] lazy tlb: introduce lazy mm refcount helper functions Nicholas Piggin
2021-06-05  1:42   ` Nicholas Piggin
2021-06-07 23:49   ` Andrew Morton
2021-06-07 23:49     ` Andrew Morton
2021-06-08  1:39     ` Nicholas Piggin
2021-06-08  1:39       ` Nicholas Piggin
2021-06-08  1:48       ` Andrew Morton
2021-06-08  1:48         ` Andrew Morton
2021-06-08  4:11         ` Nicholas Piggin
2021-06-08  4:11           ` Nicholas Piggin
2021-06-05  1:42 ` [PATCH v4 2/4] lazy tlb: allow lazy tlb mm refcounting to be configurable Nicholas Piggin
2021-06-05  1:42   ` Nicholas Piggin
2021-06-08  3:11   ` Nicholas Piggin
2021-06-08  3:11     ` Nicholas Piggin
2021-06-08 16:20   ` Andy Lutomirski
2021-06-08 16:20     ` Andy Lutomirski
2021-06-14  0:45     ` Nicholas Piggin
2021-06-14  0:45       ` Nicholas Piggin
2021-06-14  3:52       ` Andy Lutomirski
2021-06-14  3:52         ` Andy Lutomirski
2021-06-14  4:14         ` Nicholas Piggin
2021-06-14  4:14           ` Nicholas Piggin
2021-06-14  4:47           ` Nicholas Piggin
2021-06-14  4:47             ` Nicholas Piggin
2021-06-14  5:21             ` Nicholas Piggin
2021-06-14  5:21               ` Nicholas Piggin
2021-06-14 16:20               ` Andy Lutomirski
2021-06-14 16:20                 ` Andy Lutomirski
2021-06-15  0:55                 ` Nicholas Piggin
2021-06-15  0:55                   ` Nicholas Piggin
2021-06-16  0:14                   ` Andy Lutomirski
2021-06-16  0:14                     ` Andy Lutomirski
2021-06-16  1:02                     ` Nicholas Piggin
2021-06-16  1:02                       ` Nicholas Piggin
2021-06-17  0:32                       ` Nicholas Piggin
2021-06-17  0:32                         ` Nicholas Piggin
2021-06-05  1:42 ` [PATCH v4 3/4] lazy tlb: shoot lazies, a non-refcounting lazy tlb option Nicholas Piggin
2021-06-05  1:42   ` Nicholas Piggin
2021-06-08  3:15   ` Nicholas Piggin
2021-06-08  3:15     ` Nicholas Piggin
2021-06-05  1:42 ` Nicholas Piggin [this message]
2021-06-05  1:42   ` [PATCH v4 4/4] powerpc/64s: enable MMU_LAZY_TLB_SHOOTDOWN Nicholas Piggin
2021-06-07 23:52   ` Andrew Morton
2021-06-07 23:52     ` Andrew Morton
2021-06-08  2:13     ` Nicholas Piggin
2021-06-08  2:13       ` Nicholas Piggin

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