From: Paul Brook <paul@codesourcery.com>
To: qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] [4600] variable dynamic translation buffer size
Date: Wed, 28 May 2008 13:55:52 +0100 [thread overview]
Message-ID: <200805281355.53574.paul@codesourcery.com> (raw)
In-Reply-To: <E1K1KnZ-00018e-0T@cvs.savannah.gnu.org>
On Wednesday 28 May 2008, Fabrice Bellard wrote:
> + code_gen_buffer = mmap(NULL, code_gen_buffer_size,
> + PROT_WRITE | PROT_READ | PROT_EXEC,
> + flags, -1, 0);
I'd expect this to cause a significant performance regression on hosts that
have limited branch range (i.e. everything except x86). The mmap region is
almost never close to the application text segment, so all helper calls have
to be indirect.
Paul
next prev parent reply other threads:[~2008-05-28 12:56 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-05-28 12:30 [Qemu-devel] [4600] variable dynamic translation buffer size Fabrice Bellard
2008-05-28 12:55 ` Paul Brook [this message]
2008-05-28 15:11 ` Fabrice Bellard
2008-05-28 19:08 ` Blue Swirl
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