28943 2009-09-03 05:29:57 -0700 Logging fast* allocated heap usage 2009-10-08 03:47:14 -0700 1 1 1 Unclassified WebKit Web Template Framework 528+ (Nightly build) PC Linux RESOLVED INVALID P2 Normal --- 0 kbalazs webkit-unassigned mrowe oldest_to_newest 144483 0 kbalazs 2009-09-03 05:29:57 -0700 I have implemented the possibility to logging all allocations and deallocations that goes through fast* allocation functions. This could help us profiling heap usage. The implementation is restricted to linux/qt at the time, because I used glibc's backtrace function to programmatically create backtraces, and I extended only the qt build system with the option. You can build it as "build-webkit --qt --debug CONFIG+=memlogger" (building in release makes no sense since than the backtraces would not be informative). I implemented a dbus listener to create the output and a new tool -MemLogDumper- what can be used to trigger it. It has the advantage that you can create it by running any of the binaries (QtLauncher/jsc/DumpRenderTree). I am gladly welcome all suggestions about the stuff. 144484 1 38982 kbalazs 2009-09-03 05:31:05 -0700 Created attachment 38982 proposed patch 144486 2 kbalazs 2009-09-03 05:47:37 -0700 I would note that I used stl containers because those supports custom allocators. 144670 3 mrowe 2009-09-03 19:23:28 -0700 The purpose of this code isn't particularly clear to me. The comments say that it is only useful in debug builds, but debug builds of WebKit use the system memory allocator rather than TCMalloc. This means that the usual memory profiling tools can easily be used to analyze memory usage. That seems like a much more effective route to take. I'd also recommend that you take a look at the WebKit coding style guidelines: <http://webkit.org/coding/coding-style.html>. Of particular note are the lack of license headers on newly-added files, naming conventions, and brace placement. The change to the fastMalloc function seems incorrect, as the early-return bypasses the "if (!result) CRASH;" when ENABLE(FAST_MALLOC_MATCH_VALIDATION) is true. It's not clear to me what this has to do with DBus or why there is DBus-specific code in this patch. 144818 4 kbalazs 2009-09-04 09:03:04 -0700 (In reply to comment #3) > The purpose of this code isn't particularly clear to me. The comments say that > it is only useful in debug builds, but debug builds of WebKit use the system > memory allocator rather than TCMalloc. This means that the usual memory > profiling tools can easily be used to analyze memory usage. That seems like a > much more effective route to take. > I think doing the profiling in the code directly (not with external tools) has the advantage that we can better trust to the results. Btw, if you - the core developers - does not agree with that, then this patch is not valid. > I'd also recommend that you take a look at the WebKit coding style guidelines: > <http://webkit.org/coding/coding-style.html>. Of particular note are the lack > of license headers on newly-added files, naming conventions, and brace > placement. This patch would be an initial version for starting konversation about the stuff, so I did not deal with copyright or changelog. > > The change to the fastMalloc function seems incorrect, as the early-return > bypasses the "if (!result) CRASH;" when ENABLE(FAST_MALLOC_MATCH_VALIDATION) is > true. Rigth, it was a mistake. > > It's not clear to me what this has to do with DBus or why there is > DBus-specific code in this patch. I used DBus to send a message to the MemLogger object what forces it to generating a memory dump. 38982 2009-09-03 05:31:05 -0700 2009-09-03 19:23:40 -0700 proposed patch 03.diff text/plain 28807 kbalazs ZGlmZiAtLWdpdCBhL0phdmFTY3JpcHRDb3JlL0phdmFTY3JpcHRDb3JlLnByaSBiL0phdmFTY3Jp cHRDb3JlL0phdmFTY3JpcHRDb3JlLnByaQppbmRleCAwZjNmOTA5Li5kOGRiZjQ2IDEwMDY0NAot LS0gYS9KYXZhU2NyaXB0Q29yZS9KYXZhU2NyaXB0Q29yZS5wcmkKKysrIGIvSmF2YVNjcmlwdENv cmUvSmF2YVNjcmlwdENvcmUucHJpCkBAIC0yMjAsNiArMjIwLDE5IEBAIFNPVVJDRVMgKz0gXAog ICAgIHd0Zi9UaHJlYWRpbmcuY3BwIFwKICAgICB3dGYvcXQvTWFpblRocmVhZFF0LmNwcAogCitD T05GSUcobWVtbG9nZ2VyKSB7CisgICAgUVQgKz0gZGJ1cworICAgIEhFQURFUlMgKz0gd3RmL01l bUxvZ0FsbG9jYXRpb25CYWNrdHJhY2UuaCBcCisgICAgICAgICAgICAgICB3dGYvTWVtTG9nREJ1 c0xpc3RlbmVyLmggXAorICAgICAgICAgICAgICAgd3RmL01lbUxvZ2dlci5oIFwKKyAgICAgICAg ICAgICAgIHd0Zi9xdC9NZW1Mb2dQbGF0Zm9ybURCdXNMaXN0ZW5lci5oCisKKyAgICBTT1VSQ0VT ICs9IHd0Zi9NZW1Mb2dBbGxvY2F0aW9uQmFja3RyYWNlLmNwcCBcCisgICAgICAgICAgICAgICB3 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