tree f5f45a6afc5a03d98c26be94591b5777348bfad4
parent cfcbc644fead86924ae5d925ce61297e1ce0c7d5
author Daniele Di Proietto <ddiproietto@google.com> 1637778346 +0000
committer Daniele Di Proietto <ddiproietto@google.com> 1637839877 +0000

java_hprof: Regenerate the list of pids on continuous dump.

With this change, by default, the java heap profiler will rescan all the
processes every time when operating in continuous dump mode.

This is useful to collect data on processes that are not yet started
when tracing starts.

Tests:
* Regression: take a single java heap dump with a process name
  `./tools/java_heap_dump -n com.android.messaging`
* Regression: take a single java heap dump with a pid
  `./tools/java_heap_dump -p 3998`
* Regression: take a continuous java heap dump with an existing process
  name
  `./tools/java_heap_dump -n com.android.messaging -c 2000 --no-stop-when-done`
* Regression: take a continuous java heap dump with an existing pid
  `./tools/java_heap_dump -p 3998 -c 2000 --no-stop-when-done`
* New behavior: take a continuous java heap dump with the name of a
  process that gets started later.
  * `adb shell killall com.android.messaging`
  * `./tools/java_heap_dump -c com.android.messaging -c 2000 --no-stop-when-done`
  * Wait a bit
  * Start the messaging app

Bug: 200534390
Change-Id: I89bac451d6803b73009ad669bff31fbb487b9d58