On Thu, Dec 12, 2024 at 08:37:11PM +1300, Barry Song wrote: > From: Barry Song <v-songbaohua@xxxxxxxx> > > While developing the zeromap series, Usama observed that certain > workloads may contain over 10% zero-filled pages. This may present > an opportunity to save memory by mapping zero-filled pages to zero_pfn > in do_swap_page(). If a write occurs later, do_wp_page() can > allocate a new page using the Copy-on-Write mechanism. Shouldn't this be done during, or rather instead of swap out instead? Swapping all zero pages out just to optimize the in-memory representation on seems rather backwards.
