Commit Graph

112 Commits

Author SHA1 Message Date
mikhail.naganov@gmail.com
051f314a99 New heap profiler: include all heap objects and refs into snapshot.
Otherwise, retaned memory sizes are not precise. This increases size
of heap snapshot, I will deal with this later. Heap objects and
references previously missing in snapshot are now marked as 'hidden'.
That means, they not shown to user, but participate in sizes
calculation.

Other small changes:
 - added 'shortcut' graph edges: e.g. to pin global objects on top
   level;
 - meta-information in JSON snapshot is no more double encoded.

Review URL: http://codereview.chromium.org/5139002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@5849 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
2010-11-18 10:38:25 +00:00
mikhail.naganov@gmail.com
d4bc8e1585 New Heap profiler: add dumping HeapNumbers and InternalFields to snapshot.
HeapNumbers do consume memory, so it's worth dumping them. However, we
don't dump their values, as they are not as self-descriptive as values
of strings, and they will increase snapshot size. Storing heap numbers
values can be added if we will feel a sufficient demand for that.

InternalFields are used, e.g. for storing references to DOM nodes
event handlers.

Review URL: http://codereview.chromium.org/3769007

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@5635 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
2010-10-18 09:15:38 +00:00
mikhail.naganov@gmail.com
788c5e344d Better align heap snapshots contents with debugger info.
I created a heap snapshot in Chromium, and then started comparing
it side-by-side with representations of objects provided by
the debugger, fixing discrepancies.

Review URL: http://codereview.chromium.org/3590029

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@5612 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
2010-10-13 14:57:00 +00:00
mikhail.naganov@gmail.com
2388079051 Implement heap snapshots serialization into JSON. API is designed
to avoid storing serialized snapshot on VM, instead it is emitted
using output stream interface.

The size of JSON emitted is roughly equal to used heap size
(when stored as an ASCII string).

Now a whole heap snapshot can be serialized and transmitted outside
VM. This makes possible:
  - implementing non-async UI for heap snapshots inspection;
  - storing heap snapshots for further inspection;
  - remote profiling (we can even implement a snapshotting mode
    where a snapshot isn't even stored in VM, only transmitted --
    good for mobile devices);
  - creating tools for outside heap snapshots processing, e.g.
    converting to HPROF.

Review URL: http://codereview.chromium.org/3311028

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@5450 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
2010-09-14 11:49:06 +00:00
mikhail.naganov@gmail.com
e839a1ca58 Heap profiler: allow returning aggregated snapshots via the new API.
This is intended for smoother migration to the new API in Chromium.
Also, aggregated heap snapshots can be used for cheaply obtaining
heap statistics, e.g. in tests.

Review URL: http://codereview.chromium.org/3124024

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@5297 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
2010-08-18 08:19:29 +00:00
mikhail.naganov@gmail.com
1695003bb9 Heap profiler: reduce heap snapshots size.
The size of a snapshot is now 65-80% of the JS heap size (tested on
GMail and Wave), previously it was >200%.

BUG=783

Review URL: http://codereview.chromium.org/3060008

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@5211 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
2010-08-09 11:37:24 +00:00
mikhail.naganov@gmail.com
c98ac6e82c Heap profiler: implement diffing of snapshots.
To trace objects between snapshots, an external map of object tags is
maintained. After the first heap snapshot has been taken, the map is
updated by reporting object moves from the GC. If no snapshots were
taken, there is no overhead (except for flag checking).

I considered graph comparison algorithms that doesn't require using
object tags, but they are all of a high computational complexity, and
will still fail to detect object moves properly, even for trivial
cases, so using tags looks like unavoidable.

Review URL: http://codereview.chromium.org/3020002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@5078 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
2010-07-15 13:21:50 +00:00
mikhail.naganov@gmail.com
93387f272e Heap profiler: add a missing link between a function closure and shared function info.
Review URL: http://codereview.chromium.org/2846012

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@4891 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
2010-06-17 12:56:55 +00:00
mikhail.naganov@gmail.com
f213b096bc Heap profiler: publish API and add test.
Review URL: http://codereview.chromium.org/2822009

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@4864 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
2010-06-15 11:44:07 +00:00
mikhail.naganov@gmail.com
3d7ce8ac19 CPU profiler: add secure profiles by filtering out functions using security tokens.
As several pages can run in a single V8 instance, it is possible to
have functions from different security contexts intermixed in a single
CPU profile.  To avoid exposing function names from one page to
another, filtering is introduced.

The basic idea is that instead of capturing return addresses from
stack, we're now capturing JSFunction addresses (as we anyway work
only with JS stack frames.)  Each JSFunction can reach out for
context's security token. When providing a profile to a page, the
profile is filtered using the security token of caller page. Any
functions with different security tokens are filtered out (yes, we
only do fast path check for now) and their ticks are attributed to
their parents.

Review URL: http://codereview.chromium.org/2083005

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@4673 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
2010-05-18 14:19:33 +00:00
sgjesse@chromium.org
f5b5edf2a3 Adds C++ API for retrieving a stack trace without running JavaScript
This API is extensible, and parameterized with flags so that callers can specify what subset of information they want to capture for each stack frame. 

Patch by jaimeyap, see http://codereview.chromium.org/1694011 for details.
Review URL: http://codereview.chromium.org/2028001

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@4597 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
2010-05-06 07:32:44 +00:00
mikhail.naganov@gmail.com
393aa6865b C++ profiler: publish the new API, make compatible with WebKit / Chromium.
I succeeded at connecting the new implementation to Chromium, this
commit includes required (although, not all) adjustments.

Review URL: http://codereview.chromium.org/1547023

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@4349 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
2010-04-06 14:54:20 +00:00