Date: Thu, 21 Jan 1999 02:12:56 -0800 (PST) From: Matt Dillon <dillon@FreeBSD.ORG> To: cvs-committers@FreeBSD.ORG, cvs-all@FreeBSD.ORG Subject: cvs commit: src/sys/vm vm_pageout.c Message-ID: <199901211012.CAA24102@freefall.freebsd.org>
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dillon 1999/01/21 02:12:55 PST
Modified files:
sys/vm vm_pageout.c
Log:
Reorganized some of the low memory testing code to make it more useful.
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 ).
Revision Changes Path
1.131 +1 -1 src/sys/vm/vm_pageout.c
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