Re: kern/54977: xhci(4) bug: failed to create xfers

[Paul Goyette <paul%whooppee.com@localhost>]

The following reply was made to PR kern/54977; it has been noted by GNATS.

From: Paul Goyette <paul%whooppee.com@localhost>
To: gnats-bugs%netbsd.org@localhost
Cc: 
Subject: Re: kern/54977: xhci(4) bug: failed to create xfers
Date: Wed, 7 Oct 2020 12:15:55 -0700 (PDT)

 Logging commit message to the PR:
 
 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.
 
 
 From chuq@ on IRC:
 
 yea, that commit should effectively fix PR 54977
 
 
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