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From: Atish Patra <atish.patra@wdc.com>
To: linux-kernel@vger.kernel.org
Cc: Atish Patra <atish.patra@wdc.com>,
	Albert Ou <aou@eecs.berkeley.edu>,
	linux-riscv@lists.infradead.org,
	Palmer Dabbelt <palmer@sifive.com>,
	Paul Walmsley <paul.walmsley@sifive.com>,
	Christoph Hellwig <hch@lst.de>, Anup Patel <Anup.Patel@wdc.com>,
	Andreas Schwab <schwab@linux-m68k.org>
Subject: [PATCH v3 3/3] RISC-V: Do not invoke SBI call if cpumask is empty
Date: Wed, 21 Aug 2019 17:46:44 -0700	[thread overview]
Message-ID: <20190822004644.25829-4-atish.patra@wdc.com> (raw)
In-Reply-To: <20190822004644.25829-1-atish.patra@wdc.com>

SBI calls are expensive. If cpumask is empty, there is no need to
trap via SBI as no remote tlb flushing is required.

Signed-off-by: Atish Patra <atish.patra@wdc.com>
---
 arch/riscv/mm/tlbflush.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/riscv/mm/tlbflush.c b/arch/riscv/mm/tlbflush.c
index 9f58b3790baa..2bd3c418d769 100644
--- a/arch/riscv/mm/tlbflush.c
+++ b/arch/riscv/mm/tlbflush.c
@@ -21,6 +21,9 @@ static void __sbi_tlb_flush_range(struct cpumask *cmask, unsigned long start,
 		goto issue_sfence;
 	}
 
+	if (cpumask_empty(cmask))
+		goto done;
+
 	if (cpumask_test_cpu(cpuid, cmask) && cpumask_weight(cmask) == 1) {
 		if (size <= PAGE_SIZE && size != -1)
 			local_flush_tlb_page(start);
-- 
2.21.0


WARNING: multiple messages have this Message-ID (diff)
From: Atish Patra <atish.patra@wdc.com>
To: linux-kernel@vger.kernel.org
Cc: Albert Ou <aou@eecs.berkeley.edu>,
	Palmer Dabbelt <palmer@sifive.com>,
	Atish Patra <atish.patra@wdc.com>,
	Anup Patel <Anup.Patel@wdc.com>,
	Andreas Schwab <schwab@linux-m68k.org>,
	Paul Walmsley <paul.walmsley@sifive.com>,
	linux-riscv@lists.infradead.org, Christoph Hellwig <hch@lst.de>
Subject: [PATCH v3 3/3] RISC-V: Do not invoke SBI call if cpumask is empty
Date: Wed, 21 Aug 2019 17:46:44 -0700	[thread overview]
Message-ID: <20190822004644.25829-4-atish.patra@wdc.com> (raw)
In-Reply-To: <20190822004644.25829-1-atish.patra@wdc.com>

SBI calls are expensive. If cpumask is empty, there is no need to
trap via SBI as no remote tlb flushing is required.

Signed-off-by: Atish Patra <atish.patra@wdc.com>
---
 arch/riscv/mm/tlbflush.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/riscv/mm/tlbflush.c b/arch/riscv/mm/tlbflush.c
index 9f58b3790baa..2bd3c418d769 100644
--- a/arch/riscv/mm/tlbflush.c
+++ b/arch/riscv/mm/tlbflush.c
@@ -21,6 +21,9 @@ static void __sbi_tlb_flush_range(struct cpumask *cmask, unsigned long start,
 		goto issue_sfence;
 	}
 
+	if (cpumask_empty(cmask))
+		goto done;
+
 	if (cpumask_test_cpu(cpuid, cmask) && cpumask_weight(cmask) == 1) {
 		if (size <= PAGE_SIZE && size != -1)
 			local_flush_tlb_page(start);
-- 
2.21.0


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  parent reply	other threads:[~2019-08-22  0:46 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-22  0:46 [PATCH v3 0/3] Optimize tlbflush path Atish Patra
2019-08-22  0:46 ` Atish Patra
2019-08-22  0:46 ` [PATCH v3 1/3] RISC-V: Issue a local tlbflush if possible Atish Patra
2019-08-22  0:46   ` Atish Patra
2019-08-22  1:46   ` Christoph Hellwig
2019-08-22  1:46     ` Christoph Hellwig
2019-08-22  4:01     ` Atish Patra
2019-08-22  4:01       ` Atish Patra
2019-08-22  4:27       ` hch
2019-08-22  4:27         ` hch
2019-08-22  5:39         ` Atish Patra
2019-08-22  5:39           ` Atish Patra
2019-08-22  0:46 ` [PATCH v3 2/3] RISC-V: Issue a tlb page flush " Atish Patra
2019-08-22  0:46   ` Atish Patra
2019-08-22  1:50   ` Christoph Hellwig
2019-08-22  1:50     ` Christoph Hellwig
2019-08-22  4:02     ` Atish Patra
2019-08-22  4:02       ` Atish Patra
2019-08-22  0:46 ` Atish Patra [this message]
2019-08-22  0:46   ` [PATCH v3 3/3] RISC-V: Do not invoke SBI call if cpumask is empty Atish Patra
2019-08-22  1:51   ` Christoph Hellwig
2019-08-22  1:51     ` Christoph Hellwig
2019-08-22  4:23     ` Atish Patra
2019-08-22  4:23       ` Atish Patra

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