Using SlowCalls: Difference between revisions

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Using SlowCalls (view source)

Revision as of 07:30, 22 October 2010

814 bytes removed ,  22 October 2010
→‎Getting a tree with instrumentation
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First, you need to get a tree containing Javascript instrumentation that is fully working. ({{bug|507012}} added the instrumentation, but it keeps getting perturbed by JS engine changes, so that it ends up getting mismatched JS function enters/exits.)
First, you need to get a tree containing Javascript instrumentation that is fully working. ({{bug|507012}} added the instrumentation, but it keeps getting perturbed by JS engine changes, so that it ends up getting mismatched JS function enters/exits.)


=== Option 1: mozilla-central ===
I've updated the patches in {{bug|605330}} to work on top of dvander's recent refactoring of the tracemonkey branch ({{bug|603044}}). So to get it working, you'll need to apply two sets of patches:


The current (2010-Oct-11) m-c tree's JS interpreter is in an intermediate state that I can't get the instrumentation working for. So my current workaround is to do a wholesale update to a fairly recent tracemonkey and then add some patches that fix the instrumentation there.
* First, checkout the tracemonkey branch.
 
* Apply everything in {{bug|605330}}
I boiled it down into 3 ugly patches:
* Add in an instrumentation client that just logs everything to a file ({{bug|580055}}, which needs to be updated at the time of this writing)
 
* switch to tracemonkey
  hg qimport 'http://people.mozilla.org/~sfink/slowcalls-proto/import-tracemonkey'
* apply instrumentation fixes + a bunch of other irrelevant crud that I had lying around
  hg qimport 'http://people.mozilla.org/~sfink/slowcalls-proto/profiling-megapatch'
* add an instrumentation client that just logs everything to a file
  hg qimport 'http://people.mozilla.org/~sfink/slowcalls-proto/slowcalls-logger'
 
That first patch is likely to rot rather quickly. If so, you could clone revision 19b462ec16a0 and copy out the js/src subtree from there instead.
 
=== Option 2: tracemonkey ===
 
The patches in {{bug|602067}} will get to the same state as the patched mozilla-central tree, above, but dvander has rewritten the JS engine integration in {{bug|603044}} to be much, much nicer. None of my patches will be needed after this lands. But I haven't tried it yet.


== Building with instrumentation ==
== Building with instrumentation ==
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