This is a multi-part message in MIME format.
--------------03EB703D1F215B9BB3541D8F
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit

Lennart Augustsson wrote:

> I did a little more than that.  I put in some calls to microtime() in amap_wipeout()
> and I also counted the number of calls to uvm_swap_free() which does one
> call to extent_free().  With the test program below the time to do an amap_wipeout()

And here's the diff for getting the time from uvm.

    -- Lennart


--------------03EB703D1F215B9BB3541D8F
Content-Type: text/plain; charset=us-ascii;
 name="uvm.diff"
Content-Transfer-Encoding: 7bit
Content-Disposition: inline;
 filename="uvm.diff"

Index: uvm_amap.c
===================================================================
RCS file: /cvsroot/syssrc/sys/uvm/uvm_amap.c,v
retrieving revision 1.30
diff -c -r1.30 uvm_amap.c
*** uvm_amap.c	2001/02/18 21:19:09	1.30
--- uvm_amap.c	2001/02/20 06:20:02
***************
*** 499,504 ****
--- 499,508 ----
  amap_wipeout(amap)
  	struct vm_amap *amap;
  {
+ 	struct timeval start, end;
+ 	int nusf, usecs;
+ 	extern int N_uvm_swap_free;
+ 
  	int lcv, slot;
  	struct vm_anon *anon;
  	UVMHIST_FUNC("amap_wipeout"); UVMHIST_CALLED(maphist);
***************
*** 506,511 ****
--- 510,518 ----
  
  	LOCK_ASSERT(simple_lock_held(&amap->am_l));
  
+ 	microtime(&start);
+ 	nusf = N_uvm_swap_free;
+ 
  	for (lcv = 0 ; lcv < amap->am_nused ; lcv++) {
  		int refs;
  
***************
*** 528,533 ****
--- 535,547 ----
  			 */
  			uvm_anfree(anon);
  		}
+ 	}
+ 
+ 	microtime(&end);
+ 	nusf = N_uvm_swap_free - nusf;
+ 	usecs = (end.tv_sec-start.tv_sec)*1000000 + end.tv_usec-start.tv_usec;
+ 	if (usecs > 1000000) {
+ 		printf("amap_wipeout: %d usec, %d calls\n", usecs, nusf);
  	}
  
  	/*
Index: uvm_swap.c
===================================================================
RCS file: /cvsroot/syssrc/sys/uvm/uvm_swap.c,v
retrieving revision 1.46
diff -c -r1.46 uvm_swap.c
*** uvm_swap.c	2001/02/18 21:19:08	1.46
--- uvm_swap.c	2001/02/20 06:20:05
***************
*** 1538,1543 ****
--- 1538,1545 ----
  	simple_unlock(&uvm.swap_data_lock);
  }
  
+ int N_uvm_swap_free = 0;
+ 
  /*
   * uvm_swap_free: free swap slots
   *
***************
*** 1554,1559 ****
--- 1556,1563 ----
  
  	UVMHIST_LOG(pdhist, "freeing %d slots starting at %d", nslots,
  	    startslot, 0, 0);
+ 
+ 	N_uvm_swap_free++;
  
  	/*
  	 * ignore attempts to free the "bad" slot.

--------------03EB703D1F215B9BB3541D8F--