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Re: [Qemu-devel] [PATCH 02/10] compiler.h: add QEMU_CACHELINE + QEMU_ALI

From: Paolo Bonzini
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
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.6.0

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:
>> >
>> >
>> > 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.


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