CVS commit: src/sys/uvm

["Chuck Silvers" <chs%netbsd.org@localhost>]

Module Name:    src
Committed By:   chs
Date:           Wed Oct  7 17:51:50 UTC 2020

Modified Files:
        src/sys/uvm: uvm_init.c uvm_page.h uvm_pglist.c uvm_swap.c

Log Message:
Add a new, more aggressive allocator for uvm_pglistalloc() to allocate
contiguous physical pages, and try this new allocator if the existing
one fails.  The existing contig allocator only tries to allocate pages
that are already free, which works fine shortly after boot but rarely
works after the system has been up for a while.  The new allocator uses
the pagedaemon to evict pages from memory in the hope that this will
free up a range of pages that satisfies the constraits of the request.
This should help with things like plugging in a USB device, which often
fails for some USB controllers because they can't get contigous memory.


To generate a diff of this commit:
cvs rdiff -u -r1.53 -r1.54 src/sys/uvm/uvm_init.c
cvs rdiff -u -r1.106 -r1.107 src/sys/uvm/uvm_page.h
cvs rdiff -u -r1.85 -r1.86 src/sys/uvm/uvm_pglist.c
cvs rdiff -u -r1.199 -r1.200 src/sys/uvm/uvm_swap.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.