runtime: fix check for vacuous page boundary rounding again

The previous fix for this, commit 336dad2a, had everything right in
the commit message, but reversed the test in the code. Fix the test in
the code.

This reversal effectively disabled the scavenger on large page systems
*except* in the rare cases where this code was originally wrong, which
is why it didn't obviously show up in testing.

Fixes #16644. Again. :(

Change-Id: I27cce4aea13de217197db4b628f17860f27ce83e
Reviewed-on: https://go-review.googlesource.com/27402
Run-TryBot: Austin Clements <austin@google.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

diff --git a/src/runtime/mheap.go b/src/runtime/mheap.go
index 3f873267ba3969709780dd8cedce56d95b589223..8db2fcc2888bdb04df7a5abde072404be8d7c4eb 100644 (file)
--- a/src/runtime/mheap.go
+++ b/src/runtime/mheap.go
@@ -917,7 +917,9 @@ func scavengelist(list *mSpanList, now, limit uint64) uintptr {
                                // more memory than we want.)
                                start = (start + sys.PhysPageSize - 1) &^ (sys.PhysPageSize - 1)
                                end &^= sys.PhysPageSize - 1
-                               if start <= end {
+                               if end <= start {
+                                       // start and end don't span a
+                                       // whole physical page.
                                        continue
                                }
                        }