Re: [webkit-dev] If you like writing memory smashers, you'll love this
As of r177317, FastMalloc can be disabled at runtime. This means that you can use system memory analysis tools like GuardMalloc, MallocScribble, Instruments allocation tracking, leaks, and heap to debug memory issues in WebKit nightly builds, spade builds, and release builds. Is this in reference to bmalloc? Yes. Instruments allocation tracking, leaks, and heap were supported with TCMalloc-based FastMalloc for quite some time. I think you’re remembering that TCMalloc supported malloc zone introspection? Yes, it did — and bmalloc doesn’t. But zone introspection isn’t enough to get malloc/free backtraces, which is what you need in order to to do leaks analysis and allocation tracking. (And, of course, TCMalloc didn’t support scribbling, guard edges, guard malloc, and so on.) Geoff ___ webkit-dev mailing list webkit-dev@lists.webkit.org https://lists.webkit.org/mailman/listinfo/webkit-dev
Re: [webkit-dev] If you like writing memory smashers, you'll love this
On Dec 16, 2014, at 10:47, Geoffrey Garen gga...@apple.com wrote: As of r177317, FastMalloc can be disabled at runtime. This means that you can use system memory analysis tools like GuardMalloc, MallocScribble, Instruments allocation tracking, leaks, and heap to debug memory issues in WebKit nightly builds, spade builds, and release builds. Is this in reference to bmalloc? Yes. Instruments allocation tracking, leaks, and heap were supported with TCMalloc-based FastMalloc for quite some time. I think you’re remembering that TCMalloc supported malloc zone introspection? Yes, it did — and bmalloc doesn’t. But zone introspection isn’t enough to get malloc/free backtraces, which is what you need in order to to do leaks analysis and allocation tracking. (And, of course, TCMalloc didn’t support scribbling, guard edges, guard malloc, and so on.) http://trac.webkit.org/changeset/153767 http://trac.webkit.org/changeset/153767. It’s somewhat academic though since bmalloc is what is in use on tip of tree. Do we intend to move the remaining ports over to bmalloc so we can remove TCMalloc from the tree? - Mark ___ webkit-dev mailing list webkit-dev@lists.webkit.org https://lists.webkit.org/mailman/listinfo/webkit-dev
Re: [webkit-dev] If you like writing memory smashers, you'll love this
But zone introspection isn’t enough to get malloc/free backtraces, which is what you need in order to to do leaks analysis and allocation tracking. (And, of course, TCMalloc didn’t support scribbling, guard edges, guard malloc, and so on.) http://trac.webkit.org/changeset/153767 http://trac.webkit.org/changeset/153767. It’s somewhat academic though since bmalloc is what is in use on tip of tree. Holy bananas — I totally missed that! Yeah, the only features new to bmalloc are the debugging flags, then. Do we intend to move the remaining ports over to bmalloc so we can remove TCMalloc from the tree? Yes. There’s some work to adopt the right APIs for fast access to thread-specific data, and virtual memory allocation. Geoff___ webkit-dev mailing list webkit-dev@lists.webkit.org https://lists.webkit.org/mailman/listinfo/webkit-dev
[webkit-dev] If you like writing memory smashers, you'll love this
As of r177317, FastMalloc can be disabled at runtime. This means that you can use system memory analysis tools like GuardMalloc, MallocScribble, Instruments allocation tracking, leaks, and heap to debug memory issues in WebKit nightly builds, spade builds, and release builds. FastMalloc automatically disables itself in the presence of environment variables that enable Malloc debugging APIs. For giggles, you can also manually disable FastMalloc by setting the “Malloc” environment variable to “1”. Happy memory smashing. Geoff ___ webkit-dev mailing list webkit-dev@lists.webkit.org https://lists.webkit.org/mailman/listinfo/webkit-dev
Re: [webkit-dev] If you like writing memory smashers, you'll love this
On Dec 15, 2014, at 17:31, Geoffrey Garen gga...@apple.com wrote: As of r177317, FastMalloc can be disabled at runtime. This means that you can use system memory analysis tools like GuardMalloc, MallocScribble, Instruments allocation tracking, leaks, and heap to debug memory issues in WebKit nightly builds, spade builds, and release builds. Is this in reference to bmalloc? Instruments allocation tracking, leaks, and heap were supported with TCMalloc-based FastMalloc for quite some time. - Mark ___ webkit-dev mailing list webkit-dev@lists.webkit.org https://lists.webkit.org/mailman/listinfo/webkit-dev
