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Re: [Qemu-trivial] [PATCH v4 01/11] tcg: add ability to dump /tmp/perf-<

From: Paolo Bonzini
Subject: Re: [Qemu-trivial] [PATCH v4 01/11] tcg: add ability to dump /tmp/perf-<pid>.map files
Date: Tue, 4 Aug 2015 12:02:26 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.1.0

On 04/08/2015 09:39, Alex Bennée wrote:
> At the point of a tb_flush all bets are off as we will re-generate all
> the blocks at potentially different locations in the translation buffer.
> However for most analysis cases you are unlikely to cause the code
> buffer to overflow. Most other uses of tb_flush are the result
> debugging.
> I could add a printf when --perfmap is enabled to flag when a flush
> happens to signal to the user? I guess some more caveats in the flag
> description wouldn't hurt.
> We could consider truncating and re-starting the JIT dump at each flush?

Yes, it makes sense to me.  printf + truncation would work.


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