Re: [MirageOS-devel] Tracing and profiling blog post

[Anil Madhavapeddy <anil@xxxxxxxxxx>]

On 30 Oct 2014, at 16:12, Thomas Gazagnaire <thomas@xxxxxxxxxxxxxx> wrote:
> 
>> To echo Mort's comment, istr in Xenstore that there was a problem with many
>> duplicate strings for labels, so it has a module somewhere that creates
>> a Symbol.t that dedups similar strings, and also has the benefit that
>> comparison can be done via fast equality rather than byte-by-byte checking.
>> It also allows errors to be flagged up if (for example) duplicate symbol
>> names are used in different programs.
> 
> The downside if that approach is that you need a GC to collect dead symbols 
> regularly. Dave's newer versions removed that cache of symbols to keep things 
> simple.

Ah, I was wondering where that code had gone!  In the case of profiling,
there shouldn't be many dead symbols (but I can see why it's bad for the
Xenstore usecase).

-anil


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