[Mono-devel-list] [PATCH] GC Profiling Interfaces
bmaurer at ximian.com
Sat Jan 22 21:30:34 EST 2005
This is the patch that is being used for the heap profiler. I would like
to get this into the main repo, so that people don't have to patch the
This patch allows the profile to:
* Get a call back during every gc. During the call back:
* The world is stopped
* Mark bits are set
* Objects that do not have the mark bit set are still
intact (ie, they have not bee been cleared
The goal here is to allow the profiler to do a quick heap walk,
so that it can see what is still alive. Paolo before commented
that it would be better to make this a generalized heap walk.
However, this ends up being less useful for my profiler -- I
need to store some extra data for each object (the backtrace of
who allocated it). So, if I did a generalized heap walk, I would
need to store this information in a hashtable. Also, the heap
walk would tell me who *survived* each gc. But what I want to
know is who *died* in each gc. So I have to do even more work.
This just ends up being more useful.
* Test the mark bit for any object -- only useful during the above
* Get a callback each time the heap is resized
* Query the (upper bound on) the number of live bytes and the size
of the GC heap at any time.
Note that some of these are wrappers around the GC_* functions, because
we don't export them due to mono/mono/mini/ldscript.
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