On Fri 01-09-23 18:29:07, Zhaoyang Huang wrote: > loop alex > > On Thu, Aug 31, 2023 at 8:16 PM Matthew Wilcox <willy@xxxxxxxxxxxxx> wrote: > > > > On Thu, Aug 31, 2023 at 06:52:52PM +0800, zhaoyang.huang wrote: > > > From: Zhaoyang Huang <zhaoyang.huang@xxxxxxxxxx> > > > > > > There is no explicit gfp flags to let the allocation skip zero > > > operation when CONFIG_INIT_ON_ALLOC_DEFAULT_ON=y. I would like to make > > > __GFP_SKIP_ZERO be visible even if kasan is not configured. > > > > This bypasses a security feature so you're going to have to do a little > > better than "I want it". > Thanks for pointing this out. What I want to do is to give the user a > way to exempt some types of pages from being zeroed, which could help > on performance issues. Could you be more explicit about those users? Your patch doesn't add any. > Could we have the most safety concern admin > use INIT_ON_FREE while the less concerned use INIT_ON_ALLOC & > __GFP_SKIP_ZERO as a light version method? Are you suggesting the __GFP_SKIP_ZERO would be ignored in any setups except for init_on_alloc? -- Michal Hocko SUSE Labs
