More suspend timeout improvements

1) Increase suspend timeouts when the request comes from a low priority
thread. We used to double the timeout, we now triple it.
2) Rather than including /proc/<tid>/stat prefixes in timeout messages.
use /proc/<pid>/task/<tid>/stat. The former reports running times for
the process, while the latter reports thread-specific numbers. (In
spite of what the man page states.)
3) Improve the timeout message format to eliminate some redundant
information and instead include 10 more characters from the stat files,
better exposing priority-related fields.
4) We print a calculated approximation of the total wait time before
the timeout. Just printing the final wait time turned out to be
confusing.
5) Rather than lengthening the third out of 4 wait attempts more than
the others, we now lengthen the 4th and final one instead. This
means the two stat file snapshots may be further apart.

This should somewhat reduce timeouts, but mostly it further improves the
message we get when we do time out.

Bug: 366061900
Test: Treehugger
Test: Check messages with kShortSuspendTimeouts set.
Change-Id: Ife42f0b9c37c4fabe82c076c66923d9592df53f7

0 files changed, 0 insertions, 0 deletions