Date: Sun, 19 Jan 1997 21:19:06 +1100 (EST) From: Douglas Thomas Crosher <dtc@scrooge.ee.swin.oz.au> To: current@freebsd.org Subject: possible madvise MADV_FREE improvement Message-ID: <199701191019.VAA09832@scrooge.ee.swin.oz.au>
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Below is a patch which seems to improve madvise MADV_FREE; stops the
page-ins in the example recently posted. It also brings the call
closer to reliably zeroing the pages.
Regards
Douglas Crosher
-=-=-
*** vm_object.c.1 Thu Jan 16 16:12:54 1997
--- vm_object.c Sun Jan 19 21:05:45 1997
***************
*** 697,702 ****
--- 697,703 ----
{
vm_pindex_t end;
vm_page_t m;
+ int s;
if (object == NULL)
return;
***************
*** 714,721 ****
if (m == NULL || m->busy || (m->flags & PG_BUSY) ||
m->hold_count || m->wire_count ||
m->valid != VM_PAGE_BITS_ALL)
! continue;
!
if (advise == MADV_WILLNEED) {
if (m->queue != PQ_ACTIVE)
vm_page_activate(m);
--- 715,736 ----
if (m == NULL || m->busy || (m->flags & PG_BUSY) ||
m->hold_count || m->wire_count ||
m->valid != VM_PAGE_BITS_ALL)
! {
! if ( (advise!=MADV_FREE) ||
! ((object->type != OBJT_DEFAULT) &&
! (object->type != OBJT_SWAP)) )
! continue;
! else if (m == NULL) {
! swap_pager_dmzspace(object, pindex, 1);
! continue;
! } else if ( m->busy || (m->flags & PG_BUSY) ) {
! s = splvm();
! m->flags |= PG_WANTED;
! tsleep(m, PVM, "mafree", 0);
! splx(s);
! }
! }
!
if (advise == MADV_WILLNEED) {
if (m->queue != PQ_ACTIVE)
vm_page_activate(m);
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