From: Frederic Weisbecker <frederic@kernel.org>
To: Will Deacon <will@kernel.org>
Cc: LKML <linux-kernel@vger.kernel.org>,
Paul Burton <paulburton@kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
"David S . Miller" <davem@davemloft.net>,
Borislav Petkov <bp@alien8.de>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Paul Mackerras <paulus@samba.org>,
Thomas Gleixner <tglx@linutronix.de>,
Andy Lutomirski <luto@kernel.org>,
Ralf Baechle <ralf@linux-mips.org>,
Ingo Molnar <mingo@redhat.com>,
Catalin Marinas <catalin.marinas@arm.com>,
Michael Ellerman <mpe@ellerman.id.au>,
Russell King <linux@armlinux.org.uk>
Subject: Re: [PATCH 5/5] arm64: Remove TIF_NOHZ
Date: Tue, 18 Feb 2020 15:30:28 +0100 [thread overview]
Message-ID: <20200218143027.GA23864@lenoir> (raw)
In-Reply-To: <20200218085709.GB16828@willie-the-truck>
On Tue, Feb 18, 2020 at 08:57:09AM +0000, Will Deacon wrote:
> On Fri, Feb 14, 2020 at 04:26:15PM +0100, Frederic Weisbecker wrote:
> > The syscall slow path is spuriously invoked when context tracking is
> > activated while the entry code calls context tracking from fast path.
> >
> > Remove that overhead and the unused flag itself while at it.
> >
> > Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
> > Cc: Thomas Gleixner <tglx@linutronix.de>
> > Cc: Ingo Molnar <mingo@redhat.com>
> > Cc: Peter Zijlstra <peterz@infradead.org>
> > Cc: Borislav Petkov <bp@alien8.de>
> > Cc: Catalin Marinas <catalin.marinas@arm.com>
> > Cc: Will Deacon <will@kernel.org>
> > ---
> > arch/arm64/Kconfig | 1 -
> > arch/arm64/include/asm/thread_info.h | 4 +---
> > 2 files changed, 1 insertion(+), 4 deletions(-)
>
> Acked-by: Will Deacon <will@kernel.org>
>
> Do you want this to go via the arm64 tree? It looks like it makes sense
> on its own to me, so I could pick it as a fix.
Thanks Will, unfortunately it depends on some patches on the series, so
the whole needs to go together.
next prev parent reply other threads:[~2020-02-18 14:30 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-14 15:26 [PATCH 0/5] context_tracking: Remove TIF_NOHZ from 3 archs Frederic Weisbecker
2020-02-14 15:26 ` [PATCH 1/5] x86/entry: Remove _TIF_NOHZ from _TIF_WORK_SYSCALL_ENTRY Frederic Weisbecker
2020-02-14 15:26 ` [PATCH 2/5] context-tracking: Introduce CONFIG_HAVE_TIF_NOHZ Frederic Weisbecker
2020-02-14 15:26 ` [PATCH 3/5] x86: Remove TIF_NOHZ Frederic Weisbecker
2020-02-14 15:26 ` [PATCH 4/5] arm: " Frederic Weisbecker
2020-02-14 15:26 ` [PATCH 5/5] arm64: " Frederic Weisbecker
2020-02-18 8:57 ` Will Deacon
2020-02-18 14:30 ` Frederic Weisbecker [this message]
2020-02-20 15:13 ` [GIT PULL] context_tracking: Remove TIF_NOHZ from 3 archs Frederic Weisbecker
2020-02-27 13:23 ` Frederic Weisbecker
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