https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=240061
--- Comment #7 from commit-h...@freebsd.org --- A commit references this bug: Author: kib Date: Wed Sep 4 20:28:16 UTC 2019 New revision: 351830 URL: https://svnweb.freebsd.org/changeset/base/351830 Log: madvise(MADV_FREE): Quick fix to time rewind. Don't free pages in a shadowing object. While this degrades MADV_FREE to a no-op (and we could, instead, choose to fall back to MADV_DONTNEED, at the cost of changing pmap_madvise), this is presently considered a temporary fix. We may prefer to risk a little fragmentation of the map by creating a zero/OBJT_DEFAULT entry over top of the existing object and, simultaneously, revert to the existing marking any pages in the former shadowing object in the advised region as reclaimable. At least one consumer of MADV_FREE (snmalloc) may use mmap() to construct zeroed pages "eventually" here anyway, so the fragmentation may be coming anyway. Submitted by: Nathaniel Filardo <nw...@cl.cam.ac.uk> PR: 240061 Reviewed by: markj MFC after: 1 week Differential revision: https://reviews.freebsd.org/D21517 Changes: head/sys/vm/vm_map.c -- You are receiving this mail because: You are the assignee for the bug. _______________________________________________ freebsd-bugs@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-bugs To unsubscribe, send any mail to "freebsd-bugs-unsubscr...@freebsd.org"
