13b18ec947
This change moves several scheduling decisions made by schedule into findrunnable. The main motivation behind this change is the fact that stopped Ms can't become dedicated or fractional GC workers. The main reason for this is that when a stopped M wakes up, it stays in findrunnable until it finds work, which means it will never consider GC work. On that note, it'll also never consider becoming the trace reader, either. Another way of looking at it is that this change tries to make findrunnable aware of more sources of work than it was before. With this change, any M in findrunnable should be capable of becoming a GC worker, resolving #44313. While we're here, let's also make more sources of work, such as the trace reader, visible to handoffp, which should really be checking all sources of work. With that, we also now correctly handle the case where StopTrace is called from the last live M that is also locked (#39004). stoplockedm calls handoffp to start a new M and handle the work it cannot, and once we include the trace reader in that, we ensure that the trace reader gets scheduled. This change attempts to preserve the exact same ordering of work checking to reduce its impact. One consequence of this change is that upon entering schedule, some sources of work won't be checked twice (i.e. the local and global runqs, and timers) as they do now, which in some sense gives them a lower priority than they had before. Fixes #39004. Fixes #44313. Change-Id: I5d8b7f63839db8d9a3e47cdda604baac1fe615ce Reviewed-on: https://go-review.googlesource.com/c/go/+/393880 Reviewed-by: Michael Pratt <mpratt@google.com> Run-TryBot: Michael Knyszek <mknyszek@google.com> TryBot-Result: Gopher Robot <gobot@golang.org> |
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