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Reorganized some of the low memory testing code to make it more useful.

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Removed call to vm_object_collapse(), which can block.  This was being
    called without the pageout code holding any sort of reference on the
    vm_object or vm_page_t structures being manipulated.  Since this code
    can block, it was possible for other kernel code to shred the state
    the pageout code was assuming remained intact.

    Fixed potential blocking condition in vm_pageout_page_free() ( which
    could cause a deadlock in a low-memory situation ).

    Currently there is a hack in-place to deal with clean filesystem meta-data
    polluting the inactive page queue.  John doesn't like the hack, and neither
    do I.

    Revamped and commented a portion of the pageout loop.

    Added protection against potential memory deadlocks with OBJT_VNODE
    when using VOP_ISLOCKED().  The problem is that vp->v_data can be NULL
    which causes VOP_ISLOCKED() to return a less informed answer.

    remove vm_pager_sync() -- none of the pagers use it any more ( the old
    swapper used to.  The new one does not ).
This commit is contained in:
dillon 1999-01-21 10:12:54 +00:00
parent 720a95ca9b
commit c818f7c427
1 changed files with 1 additions and 1 deletions
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2
sys/vm/vm_pageout.c
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@ -65,7 +65,7 @@
* any improvements or extensions that they make and grant Carnegie the
* rights to redistribute these changes.
*
* $Id: vm_pageout.c,v 1.129 1998/10/31 17:21:31 peter Exp $
* $Id: vm_pageout.c,v 1.130 1999/01/21 08:29:12 dillon Exp $
*/
/*