diff options
Diffstat (limited to 'sys/uvm/uvm_page.c')
| -rw-r--r-- | sys/uvm/uvm_page.c | 30 |
1 files changed, 28 insertions, 2 deletions
diff --git a/sys/uvm/uvm_page.c b/sys/uvm/uvm_page.c index 6d44a95b6aa..7834b55db82 100644 --- a/sys/uvm/uvm_page.c +++ b/sys/uvm/uvm_page.c @@ -1,4 +1,4 @@ -/* $OpenBSD: uvm_page.c,v 1.114 2011/07/08 00:10:59 tedu Exp $ */ +/* $OpenBSD: uvm_page.c,v 1.115 2013/02/07 17:38:12 beck Exp $ */ /* $NetBSD: uvm_page.c,v 1.44 2000/11/27 08:40:04 chs Exp $ */ /* @@ -792,13 +792,39 @@ int uvm_pglistalloc(psize_t size, paddr_t low, paddr_t high, paddr_t alignment, paddr_t boundary, struct pglist *rlist, int nsegs, int flags) { - KASSERT((alignment & (alignment - 1)) == 0); KASSERT((boundary & (boundary - 1)) == 0); KASSERT(!(flags & UVM_PLA_WAITOK) ^ !(flags & UVM_PLA_NOWAIT)); if (size == 0) return (EINVAL); + /* + * check to see if we need to generate some free pages waking + * the pagedaemon. + */ + if ((uvmexp.free - BUFPAGES_DEFICIT) < uvmexp.freemin || + ((uvmexp.free - BUFPAGES_DEFICIT) < uvmexp.freetarg && + (uvmexp.inactive + BUFPAGES_INACT) < uvmexp.inactarg)) + wakeup(&uvm.pagedaemon); + + /* + * XXX uvm_pglistalloc is currently only used for kernel + * objects. Unlike the checks in uvm_pagealloc, below, here + * we are always allowed to use the kernel reseve. However, we + * have to enforce the pagedaemon reserve here or allocations + * via this path could consume everything and we can't + * recover in the page daemon. + */ + again: + if ((uvmexp.free <= uvmexp.reserve_pagedaemon && + !((curproc == uvm.pagedaemon_proc) || + (curproc == syncerproc)))) { + if (UVM_PLA_WAITOK) { + uvm_wait("uvm_pglistalloc"); + goto again; + } + return (ENOMEM); + } if ((high & PAGE_MASK) != PAGE_MASK) { printf("uvm_pglistalloc: Upper boundary 0x%lx " |