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Re: [Qemu-devel] Our use of #include is undisciplined, and what to do ab
From: |
Paolo Bonzini |
Subject: |
Re: [Qemu-devel] Our use of #include is undisciplined, and what to do about it |
Date: |
Thu, 17 Mar 2016 20:21:52 +0100 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.6.0 |
On 17/03/2016 17:29, Dr. David Alan Gilbert wrote:
> OK, so I see TraceEvent has a TraceEventID field; so yes that works easily;
> it turns out to be a little more expensive though since what was a:
>
> trace_events_dstate[id]
>
> is now
> trace_events_dstate[te->id]
That however makes you waste a lot of cache on trace_events_dstate
(commit 585ec72, "trace: track enabled events in a separate array",
2016-02-03).
Perhaps we get the linker to do compute the id, for example by using a
separate data section and then use te-&te_first to compute the id...
Richard, do you have ideas on how to do this in a reasonably portable
manner?
> But hang on, what's the 'sstate' in TraceEvent; do we actually need two
> state fields if we're passing a TraceEvent pointer around?
sstate means the event is unavailable, it's basically just a way to
provide better error messages.
Paolo
- Re: [Qemu-devel] Our use of #include is undisciplined, and what to do about it, (continued)
- Re: [Qemu-devel] Our use of #include is undisciplined, and what to do about it, Peter Maydell, 2016/03/15
- Re: [Qemu-devel] Our use of #include is undisciplined, and what to do about it, Stefan Hajnoczi, 2016/03/15
- Re: [Qemu-devel] Our use of #include is undisciplined, and what to do about it, Daniel P. Berrange, 2016/03/15
- Re: [Qemu-devel] Our use of #include is undisciplined, and what to do about it, Dr. David Alan Gilbert, 2016/03/15
- Re: [Qemu-devel] Our use of #include is undisciplined, and what to do about it, Stefan Hajnoczi, 2016/03/16
- Re: [Qemu-devel] Our use of #include is undisciplined, and what to do about it, Dr. David Alan Gilbert, 2016/03/16
- Re: [Qemu-devel] Our use of #include is undisciplined, and what to do about it, Stefan Hajnoczi, 2016/03/17
- Re: [Qemu-devel] Our use of #include is undisciplined, and what to do about it, Dr. David Alan Gilbert, 2016/03/17
- Re: [Qemu-devel] Our use of #include is undisciplined, and what to do about it,
Paolo Bonzini <=
- Re: [Qemu-devel] Our use of #include is undisciplined, and what to do about it, Dr. David Alan Gilbert, 2016/03/17
- Re: [Qemu-devel] Our use of #include is undisciplined, and what to do about it, Paolo Bonzini, 2016/03/17
- Re: [Qemu-devel] Our use of #include is undisciplined, and what to do about it, Richard Henderson, 2016/03/17
- Re: [Qemu-devel] Our use of #include is undisciplined, and what to do about it, Peter Maydell, 2016/03/17
- Re: [Qemu-devel] Our use of #include is undisciplined, and what to do about it, Richard Henderson, 2016/03/17
- Re: [Qemu-devel] Our use of #include is undisciplined, and what to do about it, Paolo Bonzini, 2016/03/17
- Re: [Qemu-devel] Our use of #include is undisciplined, and what to do about it, Paolo Bonzini, 2016/03/17
Re: [Qemu-devel] Our use of #include is undisciplined, and what to do about it, Richard Henderson, 2016/03/17