On Thu, 2 Jun 2011 17:25:50 -0400, Robert A. Rosenberg wrote: > >I might have phrased my description incorrectly. What I was saying is >that when you initially allocate an virtual area when that area is >actually mapped to memory the page that gets loaded (paged-in) is >pre-zeroed. I was just suggesting that this would be simplest to do >if there was a single pre-zeroed page to be used for the page-in and >the mapping table entry was marked to not use that DASD copy as the >target when the virtual page needs to be paged out again. > Are you suggesting that it's more efficient to zero a page by reading in a page of zeroes from DASD than by MVC[L], overlapping, in a loop, whatever?
Based on the anecdotes here so far, I'd vote for STM in a loop. >BTW: Is my impression that if I use STORAGE to allocate a >MULTIPLE-PAGE area, then the virtual page will be pre-zeroed? If so, >how is this done? > Does it depend on whether the physical page(s) allocated previously belonged to a different address space or to the same address space? -- gil ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
