linux-kernel - [PATCH v2 2/3] RISC-V: Enable TLBFLUSH counters for debug kernel.

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Message-Id: <20190429195759.18330-3-atish.patra@wdc.com>
Date:   Mon, 29 Apr 2019 12:57:58 -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>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Anup Patel <anup@...infault.org>,
        Borislav Petkov <bp@...en8.de>,
        Changbin Du <changbin.du@...el.com>,
        Gary Guo <gary@...yguo.net>, "H. Peter Anvin" <hpa@...or.com>,
        Ingo Molnar <mingo@...hat.com>,
        Kees Cook <keescook@...omium.org>, linux-mm@...ck.org,
        linux-riscv@...ts.infradead.org,
        Luc Van Oostenryck <luc.vanoostenryck@...il.com>,
        Palmer Dabbelt <palmer@...ive.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Vlastimil Babka <vbabka@...e.cz>,
        x86@...nel.org (maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)),
        Christoph Hellwig <hch@...radead.org>
Subject: [PATCH v2 2/3] RISC-V: Enable TLBFLUSH counters for debug kernel.

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 | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index eb56c82d8aa1..c1ee876d1e7f 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -49,6 +49,7 @@ config RISCV
 	select GENERIC_IRQ_MULTI_HANDLER
 	select ARCH_HAS_PTE_SPECIAL
 	select HAVE_EBPF_JIT if 64BIT
+	select HAVE_ARCH_DEBUG_TLBFLUSH if DEBUG_KERNEL
 
 config MMU
 	def_bool y
-- 
2.21.0