Summary:
Adds iteration of all application memory in an efficient manner using
shadow faults. Shadow memory starts out inaccessible and we mark it
writable one page at a time on each fault when the instrumentation touches
it. This allows iteration over just the mapped shadow memory, saving
significant time.
Adds a process-end iteration and pretty-printing of the final result.
Adds a new test and updates the existing tests.
Reviewers: aizatsky, filcab
Subscribers: vitalybuka, zhaoqin, kcc, eugenis, llvm-commits, kubabrecka
Differential Revision: http://reviews.llvm.org/D20578
llvm-svn: 271277
Summary:
Adds detection of large stack size rlimits (over 1 TB or unlimited), which
results in an mmap location that our shadow mapping does not support. We
re-exec the application in this situation. Adds a test of this behavior.
Adds general detection of mmap regions outside of our app regions. In the
future we want to try to adaptively handle these but for now we abort.
Moves the existing Linux-specific mmap code into a platform-specific file
where the new rlimit code lives.
Reviewers: eugenis
Subscribers: vitalybuka, zhaoqin, kcc, aizatsky, llvm-commits, kubabrecka
Differential Revision: http://reviews.llvm.org/D20745
llvm-svn: 271079
Fixes an esan workingset-memset test failure by switching to malloc to
avoid a shadow mapping issue with mmap in certain situations that will be
fully fixed separately.
llvm-svn: 270949
Summary:
Adds the base runtime library for the working set tool.
Adds slowpath code for updating the shadow memory.
To be added in the future:
+ Scan memory and report the total size.
+ Take samples for intermediate values.
Reviewers: aizatsky
Subscribers: kubabrecka, vitalybuka, zhaoqin, kcc, eugenis, llvm-commits
Differential Revision: http://reviews.llvm.org/D20485
llvm-svn: 270650
Derek Bruening