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- Log -----------------------------------------------------------------
commit c78fe96446794f71a2db7d7e3d43cb15658590a3
Author: Richard Braun <rbr...@sceen.net>
Date: Fri Sep 16 04:39:02 2016 +0200
VM: improve pageout deadlock workaround
Commit 5dd4f67522ad0d49a2cecdb9b109251f546d4dd1 makes VM map entry
allocation done with VM privilege, so that a VM map isn't held locked
while physical allocations are paused, which may block the default
pager during page eviction, causing a system-wide deadlock.
First, it turns out that map entries aren't the only buffers allocated,
and second, their number can't be easily determined, which makes a
preallocation strategy very hard to implement.
This change generalizes the strategy of VM privilege increase when a
VM map is locked.
* device/ds_routines.c (io_done_thread): Use integer values instead
of booleans when setting VM privilege.
* kern/thread.c (thread_init, thread_wire): Likewise.
* vm/vm_pageout.c (vm_pageout): Likewise.
* kern/thread.h (struct thread): Turn member `vm_privilege' into an
unsigned integer.
* vm/vm_map.c (vm_map_lock): New function, where VM privilege is
temporarily increased.
(vm_map_unlock): New function, where VM privilege is decreased.
(_vm_map_entry_create): Remove VM privilege workaround from this
function.
* vm/vm_map.h (vm_map_lock, vm_map_unlock): Turn into functions.
-----------------------------------------------------------------------
Summary of changes:
device/ds_routines.c | 2 +-
kern/thread.c | 6 ++---
kern/thread.h | 5 ++--
vm/vm_map.c | 63 ++++++++++++++++++++++++++++++++------------------
vm/vm_map.h | 8 ++-----
vm/vm_pageout.c | 2 +-
6 files changed, 49 insertions(+), 37 deletions(-)
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