Differential D8302 Diff 22110 head/sys/vm/swap_pager.c

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head/sys/vm/swap_pager.c

Show First 20 Lines • Show All 1,543 Lines • ▼ Show 20 Lines	if (bp->b_ioflags & BIO_ERROR) {
if (i < bp->b_pgbefore \|\|		if (i < bp->b_pgbefore \|\|
i >= bp->b_npages - bp->b_pgafter)		i >= bp->b_npages - bp->b_pgafter)
vm_page_readahead_finish(m);		vm_page_readahead_finish(m);
} else {		} else {
/*		/*
* For write success, clear the dirty		* For write success, clear the dirty
* status, then finish the I/O ( which decrements the		* status, then finish the I/O ( which decrements the
* busy count and possibly wakes waiter's up ).		* busy count and possibly wakes waiter's up ).
		* A page is only written to swap after a period of
		* inactivity. Therefore, we do not expect it to be
		* reused.
*/		*/
KASSERT(!pmap_page_is_write_mapped(m),		KASSERT(!pmap_page_is_write_mapped(m),
("swp_pager_async_iodone: page %p is not write"		("swp_pager_async_iodone: page %p is not write"
" protected", m));		" protected", m));
vm_page_undirty(m);		vm_page_undirty(m);
vm_page_sunbusy(m);
if (vm_page_count_severe()) {
vm_page_lock(m);		vm_page_lock(m);
vm_page_try_to_cache(m);		vm_page_deactivate_noreuse(m);
vm_page_unlock(m);		vm_page_unlock(m);
		vm_page_sunbusy(m);
}		}
}		}
}

/*		/*
* adjust pip. NOTE: the original parent may still have its own		* adjust pip. NOTE: the original parent may still have its own
* pip refs on the object.		* pip refs on the object.
*/		*/
if (object != NULL) {		if (object != NULL) {
vm_object_pip_wakeupn(object, bp->b_npages);		vm_object_pip_wakeupn(object, bp->b_npages);
VM_OBJECT_WUNLOCK(object);		VM_OBJECT_WUNLOCK(object);
▲ Show 20 Lines • Show All 57 Lines • ▼ Show 20 Lines	swap_pager_isswapped(vm_object_t object, struct swdevt *sp)
}		}
mtx_unlock(&swhash_mtx);		mtx_unlock(&swhash_mtx);
return (0);		return (0);
}		}

/*		/*
* SWP_PAGER_FORCE_PAGEIN() - force a swap block to be paged in		* SWP_PAGER_FORCE_PAGEIN() - force a swap block to be paged in
*		*
* This routine dissociates the page at the given index within a		* This routine dissociates the page at the given index within an object
* swap block from its backing store, paging it in if necessary.		* from its backing store, paging it in if it does not reside in memory.
* If the page is paged in, it is placed in the inactive queue,		* If the page is paged in, it is marked dirty and placed in the laundry
* since it had its backing store ripped out from under it.		* queue. The page is marked dirty because it no longer has backing
* We also attempt to swap in all other pages in the swap block,		* store. It is placed in the laundry queue because it has not been
* we only guarantee that the one at the specified index is		* accessed recently. Otherwise, it would already reside in memory.
		*
		* We also attempt to swap in all other pages in the swap block.
		* However, we only guarantee that the one at the specified index is
* paged in.		* paged in.
*		*
* XXX - The code to page the whole block in doesn't work, so we		* XXX - The code to page the whole block in doesn't work, so we
* revert to the one-by-one behavior for now. Sigh.		* revert to the one-by-one behavior for now. Sigh.
*/		*/
static inline void		static inline void
swp_pager_force_pagein(vm_object_t object, vm_pindex_t pindex)		swp_pager_force_pagein(vm_object_t object, vm_pindex_t pindex)
{		{
Show All 12 Lines	if (m->valid == VM_PAGE_BITS_ALL) {
return;		return;
}		}

if (swap_pager_getpages(object, &m, 1, NULL, NULL) != VM_PAGER_OK)		if (swap_pager_getpages(object, &m, 1, NULL, NULL) != VM_PAGER_OK)
panic("swap_pager_force_pagein: read from swap failed");/XXX/		panic("swap_pager_force_pagein: read from swap failed");/XXX/
vm_object_pip_wakeup(object);		vm_object_pip_wakeup(object);
vm_page_dirty(m);		vm_page_dirty(m);
vm_page_lock(m);		vm_page_lock(m);
vm_page_deactivate(m);		vm_page_launder(m);
vm_page_unlock(m);		vm_page_unlock(m);
vm_page_xunbusy(m);		vm_page_xunbusy(m);
vm_pager_page_unswapped(m);		vm_pager_page_unswapped(m);
}		}

/*		/*
* swap_pager_swapoff:		* swap_pager_swapoff:
*		*
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