[SCM] GNU Mach branch, master, updated. v1.7-69-g4603229

[Richard Braun]

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- Log -----------------------------------------------------------------
commit 4603229779d2ac08f52028f31108c90c853bae0d
Author: Richard Braun <address@hidden>
Date:   Wed Nov 30 01:56:56 2016 +0100

    VM: fix pageout stop condition
    
    When checking whether to continue paging out or not, the pageout daemon
    only considers the high free page threshold of a segment. But if e.g.
    the default pager had to allocate reserved pages during a previous
    pageout cycle, it could have exhausted a segment (this is currently
    only seen with the DMA segment). In that case, the high threshold
    cannot be reached because the segment has currently no pageable page.
    
    This change makes the pageout daemon identify this condition and
    consider the segment as usable in order to make progress. The segment
    will simply be ignored on the allocation path for unprivileged threads,
    and if this happens with too many segments, the system will fail at
    allocation time.
    
    * vm/vm_page.c (vm_page_seg_usable): Report usable if the segment has
    no pageable page.

-----------------------------------------------------------------------

Summary of changes:
 vm/vm_page.c |    5 +++++
 1 file changed, 5 insertions(+)


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