| # PartitionAlloc tools |
| |
| This directory contains tools useful to inspect, debug and optimize |
| PartitionAlloc. In particular, `pa_tcache_inspect` is used to inspect a running |
| Chrome instance, and report statistics on its thread caches. |
| |
| ## `pa_tcache_inspect` |
| |
| This tool displays data about any running Chrome process. The main constraint is |
| that both the tool and the running instance have to be built at revisions where |
| the allocator's layout is identical. For best results, it should be the same |
| revision whenever possible. |
| |
| It works by first identifying the address of the thread cache registry, then use |
| it to find out all other data structures. They are then read from the remote |
| process, and displayed live. |
| |
| The tool must be able to read the remote process memory, which on some Debian |
| configurations requires running: |
| |
| ``` |
| sudo sh -c 'echo 0 > /proc/sys/kernel/yama/ptrace_scope |
| ``` |
