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From: Arnd Bergmann <arnd@arndb.de>
To: "Jason A. Donenfeld" <Jason@zx2c4.com>
Cc: Oleksandr Natalenko <oleksandr@redhat.com>,
	LKML <linux-kernel@vger.kernel.org>, X86 ML <x86@kernel.org>,
	Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [PATCH] Kconfig: default to CC_OPTIMIZE_FOR_PERFORMANCE_O3 for gcc >= 10
Date: Fri, 8 May 2020 15:04:25 +0200	[thread overview]
Message-ID: <CAK8P3a06DmZr4cJt=v+1uT4sT-E3yWkeg-YioyjK3GZR5Twunw@mail.gmail.com> (raw)
In-Reply-To: <CAHmME9p7Hri-vHfwR9GY1gPo91jVx4-hTqsZVRHiioUENRHibA@mail.gmail.com>

On Fri, May 8, 2020 at 2:07 PM Jason A. Donenfeld <Jason@zx2c4.com> wrote:
> On Fri, May 8, 2020 at 5:56 AM Arnd Bergmann <arnd@arndb.de> wrote:
>
> The other significant thing -- and what prompted this patchset -- is
> it looks like gcc 10 has lowered the inlining degree for -O2, and put
> gcc 9's inlining parameters from -O2 into gcc-10's -O3.

I suspect it is more complicated than that, as there are a number of
parameters that determine inlining decisions. It's also not clear whether
the ones for -O3 are generally better than the ones with -O2, or if it's
just that whatever changed caused a few surprises but is otherwise
preferable.

Did you see regressions in specific modules, or just a general slowdown
or growth in object size as the result?

      Arnd

  reply	other threads:[~2020-05-08 13:04 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-07 22:45 Jason A. Donenfeld
2020-05-08  8:35 ` Peter Zijlstra
2020-05-08  9:02 ` Oleksandr Natalenko
2020-05-08 11:21   ` Jason A. Donenfeld
2020-05-08 11:33     ` Oleksandr Natalenko
2020-05-08 11:49       ` Arnd Bergmann
2020-05-08 12:07         ` Jason A. Donenfeld
2020-05-08 13:04           ` Arnd Bergmann [this message]
2020-05-08 15:06         ` Joe Perches
2020-05-08 15:09           ` Arnd Bergmann
2020-05-10 12:47           ` David Laight
2020-05-10 17:45             ` Joe Perches
2020-05-10 18:58               ` David Laight
2020-05-12  1:10             ` Masahiro Yamada
2020-05-11 21:57   ` [PATCH v2] " Jason A. Donenfeld
2020-05-12  0:04     ` Linus Torvalds
2020-05-12  0:09       ` Linus Torvalds
2020-05-12  0:43       ` Jason A. Donenfeld
2020-05-12  8:44       ` Richard Biener
2020-05-13 11:27 ` [PATCH] " Artem S. Tashkinov

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