linux-kernel - [3/3] RISC-V: Add DEBUG

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Date:   Wed, 10 Apr 2019 15:44:49 -0700
From:   Atish Patra <atish.patra@....com>
To:     linux-kernel@...r.kernel.org
Cc:     Atish Patra <atish.patra@....com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Anup Patel <anup@...infault.org>,
        Borislav Petkov <bp@...en8.de>, Gary Guo <gary@...yguo.net>,
        "H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
        linux-riscv@...ts.infradead.org,
        Luc Van Oostenryck <luc.vanoostenryck@...il.com>,
        Palmer Dabbelt <palmer@...ive.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        x86@...nel.org (maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT))
Subject: [3/3] RISC-V: Add DEBUG_TLBFLUSH option.

The TLB flush counters under vmstat seems to be very helpful while
debugging TLB flush performance in RISC-V.

Add the Kconfig option only for debug kernels.

Signed-off-by: Atish Patra <atish.patra@....com>
---
 arch/riscv/Kconfig.debug | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/arch/riscv/Kconfig.debug b/arch/riscv/Kconfig.debug
index e69de29bb2d1..6a2d3762aeda 100644
--- a/arch/riscv/Kconfig.debug
+++ b/arch/riscv/Kconfig.debug
@@ -0,0 +1,12 @@
+# SPDX-License-Identifier: GPL-2.0
+
+config DEBUG_TLBFLUSH
+	bool "Save tlb flush statstics to vmstat"
+	depends on DEBUG_KERNEL
+	help
+
+	Add TLB flush statstics to vmstat. It is really helpful understand tlbflush
+	performance and behavior. It should be enabled only for debugging purpose.
+
+	If in doubt, say "N".
+
-- 
2.21.0