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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 13:21:50 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.7.1

On 30/04/2016 05:40, Emilio G. Cota wrote:
>> The tb_flush
>> > is a fairly rare occurrence its not like its on the critical performance
>> > path (although of course pathological cases are possible).
> This is what I thought from the beginning, but wanted to give this
> alternative a go anyway to see if it was feasible.
> On my end I won't do any more work on this approach. Will go back
> to locks, despite Paolo's (justified) dislike for them =)

Which locks?  tb_lock during tb_find_fast?  The problem with that was
that it slowed down everything a lot, wasn't it?

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.


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