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b32e961a84
The kernel now supports basic profiling of all the threads in a process
by calling profiling_enable(pid_t). You finish the profiling by calling
profiling_disable(pid_t).
This all works by recording thread stacks when the timer interrupt
fires and the current thread is in a process being profiled.
Note that symbolication is deferred until profiling_disable() to avoid
adding more noise than necessary to the profile.
A simple "/bin/profile" command is included here that can be used to
start/stop profiling like so:
$ profile 10 on
... wait ...
$ profile 10 off
After a profile has been recorded, it can be fetched in /proc/profile
There are various limits (or "bugs") on this mechanism at the moment:
- Only one process can be profiled at a time.
- We allocate 8MB for the samples, if you use more space, things will
not work, and probably break a bit.
- Things will probably fall apart if the profiled process dies during
profiling, or while extracing /proc/profile
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| .. | ||
| Custody.cpp | ||
| Custody.h | ||
| DevPtsFS.cpp | ||
| DevPtsFS.h | ||
| DiskBackedFileSystem.cpp | ||
| DiskBackedFileSystem.h | ||
| ext2_fs.h | ||
| ext2_types.h | ||
| Ext2FileSystem.cpp | ||
| Ext2FileSystem.h | ||
| FIFO.cpp | ||
| FIFO.h | ||
| File.cpp | ||
| File.h | ||
| FileDescription.cpp | ||
| FileDescription.h | ||
| FileSystem.cpp | ||
| FileSystem.h | ||
| Inode.cpp | ||
| Inode.h | ||
| InodeFile.cpp | ||
| InodeFile.h | ||
| InodeIdentifier.h | ||
| InodeMetadata.h | ||
| InodeWatcher.cpp | ||
| InodeWatcher.h | ||
| ProcFS.cpp | ||
| ProcFS.h | ||
| SharedMemory.cpp | ||
| SharedMemory.h | ||
| TmpFS.cpp | ||
| TmpFS.h | ||
| VirtualFileSystem.cpp | ||
| VirtualFileSystem.h | ||