- Change vm_page_reclaim_contig[_domain] to return an errno instead
of a boolean. 0 indicates a successful reclaim, ENOMEM indicates
lack of available memory to reclaim, with any other error (currently
only ERANGE) indicating that reclamation is impossible for the
specified address range. Change all callers to only follow
up with vm_page_wait* in the ENOMEM case.
- Introduce vm_domainset_iter_ignore(), which marks the specified
domain as unavailable for further use by the iterator. Use this
function to ignore domains that can't possibly satisfy a physical
allocation request. Since WAITOK allocations run the iterators
repeatedly, this avoids the possibility of infinitely spinning
in domain iteration if no available domain can satisfy the
allocation request.
PR: 274252
Reported by: kevans
Tested by: kevans
Reviewed by: markj
Differential Revision: https://reviews.freebsd.org/D42706
(cherry picked from commit 2619c5ccfe1f7889f0241916bd17d06340142b05)
MFCed as a prerequisite for further MFC of VM domainset changes. Based
on analysis, it would not hurt, and I have been using it in productions
for months now.
Resolved the trivial conflict due to commit 718d1928f874 ("LinuxKPI:
make linux_alloc_pages() honor __GFP_NORETRY") having been MFCed before
this one.
64f4e2bdf5