From: "H. Peter Anvin" <hpa@zytor.com>
To: Joe Damato <ice799@gmail.com>
Cc: Andi Kleen <andi@firstfloor.org>, Ingo Molnar <mingo@elte.hu>,
Jeff Garzik <jeff@garzik.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
LKML <linux-kernel@vger.kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>,
x86@kernel.org
Subject: Re: [PATCH] X86-32: Let gcc decide whether to inline memcpy was Re: New x86 warning
Date: Thu, 23 Apr 2009 15:09:01 -0700 [thread overview]
Message-ID: <49F0E6FD.8030108@zytor.com> (raw)
In-Reply-To: <3605561d0904231422s57bd4cedl722be1dabf27428f@mail.gmail.com>
Joe Damato wrote:
>
> Looks like this thread is dead/dying, but figured I should reply with
> my test findings. The number of out-of-line calls (as determined by:
> make mrproper && make defconfig && make && objdump -d vmlinux | grep
> "call.*\<memset" | wc -l))
>
> gcc 4.2.4 - withOUT memset patch: 20
> gcc 4.2.4 - with memset patch: 365
>
> gcc 3.4 - withOUT memset patch: 17
> gcc 3.4 - with memset patch: 349
>
> I'm guessing this is probably not acceptable, so I won't bother
> installing/trying gcc-3.2 unless anyone thinks that a 300+ increase in
> out-of-line calls is OK.
>
Not unless it can be proven those calls are in non-performance-critical
contexts. That's a lot of work to go through, though.
-hpa
next prev parent reply other threads:[~2009-04-23 22:13 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-04-22 6:46 New x86 warning Jeff Garzik
2009-04-22 7:01 ` Ingo Molnar
2009-04-22 8:45 ` [PATCH] X86-32: Let gcc decide whether to inline memcpy was " Andi Kleen
2009-04-22 18:00 ` [tip:x86/asm] x86: use __builtin_memcpy() on 32 bits tip-bot for Andi Kleen
2009-04-22 20:56 ` [PATCH] X86-32: Let gcc decide whether to inline memcpy was Re: New x86 warning Linus Torvalds
2009-04-22 21:15 ` Andi Kleen
2009-04-22 21:19 ` Linus Torvalds
2009-04-22 22:04 ` Andi Kleen
2009-04-23 6:08 ` fresh data was " Andi Kleen
2009-04-23 6:36 ` Ingo Molnar
2009-04-23 7:37 ` Andi Kleen
2009-04-23 6:30 ` Ingo Molnar
2009-04-23 7:43 ` Andi Kleen
2009-04-22 23:49 ` Joe Damato
2009-04-23 1:48 ` H. Peter Anvin
2009-04-23 21:22 ` Joe Damato
2009-04-23 22:09 ` H. Peter Anvin [this message]
2009-04-24 8:44 ` Andi Kleen
2009-04-23 6:09 ` Andi Kleen
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