From: Paolo Bonzini <pbonzini@redhat.com>
To: "Peter Maydell" <peter.maydell@linaro.org>,
"Emilio G. Cota" <cota@braap.org>,
"QEMU Developers" <qemu-devel@nongnu.org>,
"MTTCG Devel" <mttcg@greensocs.com>,
"Peter Crosthwaite" <crosthwaite.peter@gmail.com>,
"Sergey Fedorov" <serge.fdrv@gmail.com>,
"Alex Bennée" <alex.bennee@linaro.org>,
"Richard Henderson" <rth@twiddle.net>
Subject: Re: [Qemu-devel] [PATCH 02/10] compiler.h: add QEMU_CACHELINE + QEMU_ALIGN() + QEMU_CACHELINE_ALIGNED
Date: Tue, 5 Apr 2016 17:29:05 +0200 [thread overview]
Message-ID: <5703D9C1.2090307@redhat.com> (raw)
In-Reply-To: <CAFEAcA_mCnM4tXb=pgaqoTWz+kCOXNZUnX6s3mJ3Pa9L5AWZZA@mail.gmail.com>
On 05/04/2016 14:58, Peter Maydell wrote:
>> >
>> > You should make this a value taken from configure. In linux you could use
>> > something like:
>> >
>> > getconf LEVEL1_DCACHE_LINESIZE
>> >
>> > Or an equivalent program using sysconf(3) if getconf is not present.
> The cache line size at compile time is not necessarily the cache
> line size at runtime...
But the size of data structures cannot change at run-time. A bigger
worry is cross-compilation.
Linux has these defaults:
Alpha 32 or 64
ARM configurable, 64 for ARMv7
AArch64 128
PPC 128
s390 256
x86 configurable, default 64
which should be easy to copy in QEMU too.
Paolo
next prev parent reply other threads:[~2016-04-05 15:29 UTC|newest]
Thread overview: 62+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-04-05 5:30 [Qemu-devel] [PATCH 00/10] tb hash improvements Emilio G. Cota
2016-04-05 5:30 ` [Qemu-devel] [PATCH 01/10] translate-all: add missing fold of tb_ctx into tcg_ctx Emilio G. Cota
2016-04-05 8:49 ` Paolo Bonzini
2016-04-05 5:30 ` [Qemu-devel] [PATCH 02/10] compiler.h: add QEMU_CACHELINE + QEMU_ALIGN() + QEMU_CACHELINE_ALIGNED Emilio G. Cota
2016-04-05 7:57 ` Peter Maydell
2016-04-05 17:24 ` Emilio G. Cota
2016-04-05 18:01 ` Peter Maydell
2016-04-05 19:13 ` Emilio G. Cota
2016-04-05 8:49 ` Paolo Bonzini
2016-04-05 12:57 ` Lluís Vilanova
2016-04-05 12:58 ` Peter Maydell
2016-04-05 15:29 ` Paolo Bonzini [this message]
2016-04-05 16:23 ` Lluís Vilanova
2016-04-05 16:31 ` Richard Henderson
2016-04-05 16:56 ` Peter Maydell
2016-04-05 19:02 ` Lluís Vilanova
2016-04-05 19:15 ` Richard Henderson
2016-04-05 20:09 ` Lluís Vilanova
2016-04-06 11:44 ` Paolo Bonzini
2016-04-06 12:02 ` Laurent Desnogues
2016-04-05 5:30 ` [Qemu-devel] [PATCH 03/10] seqlock: remove optional mutex Emilio G. Cota
2016-04-06 8:38 ` Alex Bennée
2016-04-05 5:30 ` [Qemu-devel] [PATCH 04/10] seqlock: rename write_lock/unlock to write_begin/end Emilio G. Cota
2016-04-06 8:42 ` Alex Bennée
2016-04-05 5:30 ` [Qemu-devel] [PATCH 05/10] include: add spinlock wrapper Emilio G. Cota
2016-04-05 8:51 ` Paolo Bonzini
2016-04-06 15:51 ` Alex Bennée
2016-04-05 5:30 ` [Qemu-devel] [PATCH 06/10] include: add xxhash.h Emilio G. Cota
2016-04-06 11:39 ` Alex Bennée
2016-04-06 22:59 ` Emilio G. Cota
2016-04-05 5:30 ` [Qemu-devel] [PATCH 07/10] tb hash: hash phys_pc, pc, and flags with xxhash Emilio G. Cota
2016-04-05 15:41 ` Richard Henderson
2016-04-05 15:48 ` Paolo Bonzini
2016-04-05 16:07 ` Richard Henderson
2016-04-05 19:40 ` Emilio G. Cota
2016-04-05 21:08 ` Richard Henderson
2016-04-06 0:52 ` Emilio G. Cota
2016-04-06 11:52 ` Paolo Bonzini
2016-04-06 17:44 ` Emilio G. Cota
2016-04-06 18:23 ` Paolo Bonzini
2016-04-06 18:27 ` Richard Henderson
2016-04-07 0:37 ` Emilio G. Cota
2016-04-07 8:46 ` Paolo Bonzini
2016-04-05 16:33 ` Laurent Desnogues
2016-04-05 17:19 ` Richard Henderson
2016-04-06 6:06 ` Laurent Desnogues
2016-04-06 17:32 ` Emilio G. Cota
2016-04-06 17:42 ` Richard Henderson
2016-04-07 8:12 ` Laurent Desnogues
2016-04-05 5:30 ` [Qemu-devel] [PATCH 08/10] qht: QEMU's fast, resizable and scalable Hash Table Emilio G. Cota
2016-04-05 9:01 ` Paolo Bonzini
2016-04-05 15:50 ` Richard Henderson
2016-04-08 10:27 ` Alex Bennée
2016-04-19 23:03 ` Emilio G. Cota
2016-04-05 5:30 ` [Qemu-devel] [PATCH 09/10] qht: add test program Emilio G. Cota
2016-04-08 10:45 ` Alex Bennée
2016-04-19 23:06 ` Emilio G. Cota
2016-04-20 7:50 ` Alex Bennée
2016-04-05 5:30 ` [Qemu-devel] [PATCH 10/10] tb hash: track translated blocks with qht Emilio G. Cota
2016-04-08 12:39 ` Alex Bennée
2016-04-05 8:47 ` [Qemu-devel] [PATCH 00/10] tb hash improvements Alex Bennée
2016-04-05 9:01 ` Paolo Bonzini
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