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Re: [Qemu-devel] [RFC v3] translate-all: protect code_gen_buffer with RC

From: Paolo Bonzini
Subject: Re: [Qemu-devel] [RFC v3] translate-all: protect code_gen_buffer with RCU
Date: Mon, 9 May 2016 15:55:54 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.7.1

On 09/05/2016 13:50, Alex Bennée wrote:
> > Which locks?  tb_lock during tb_find_fast?  The problem with that was
> > that it slowed down everything a lot, wasn't it?
> Very much so, in the new tree (coming soon) with QHT I was able to
> remove the locks from the whole hot-path which means they where only
> needed for code generation.

Okay, I'm curious now. :)

> > To me, the RCU idea is not really about making tb_flush (the rare case)
> > faster; it was more about keeping the rest simple and fast.
> I'm not sure it achieved that as there is added complexity from having
> the split buffer and then ensuring you don't double-flush.



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