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Minor optimization to madvise() MADV_FREE to make page as freeable as

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possible without actually unmapping it from the process.

    As of now, I declare madvise() on OBJT_DEFAULT/OBJT_SWAP objects to be
    'working and complete'.
This commit is contained in:
Matthew Dillon 1999-02-12 20:42:19 +00:00
parent 366b60bfed
commit 41c67e12bd
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=43941
1 changed files with 7 additions and 1 deletions
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8
sys/vm/vm_object.c
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@ -61,7 +61,7 @@
* any improvements or extensions that they make and grant Carnegie the
* rights to redistribute these changes.
*
* $Id: vm_object.c,v 1.148 1999/02/08 19:00:15 dillon Exp $
* $Id: vm_object.c,v 1.149 1999/02/12 09:51:43 dillon Exp $
*/
/*
@ -844,9 +844,15 @@ vm_object_madvise(object, pindex, count, advise)
* Specifically, we do not try to actually free
* the page now nor do we try to put it in the
* cache (which would cause a page fault on reuse).
*
* But we do make the page is freeable as we
* can without actually taking the step of unmapping
* it.
*/
pmap_clear_modify(VM_PAGE_TO_PHYS(m));
m->dirty = 0;
m->act_count = 0;
vm_page_deactivate(m);
}
}
}