On Tue, 2018-10-30 at 09:15 +0100, Michal Hocko wrote: > On Tue 30-10-18 14:55:51, Miles Chen wrote: > [...] > > It's a real problem when using page_owner. > > I found this issue recently: I'm not able to read page_owner information > > during a overnight test. (error: read failed: Out of memory). I replace > > kmalloc() with vmalloc() and it worked well. > > Is this with trimming the allocation to a single page and doing shorter > than requested reads? I printed out the allocate count on my device the request count is <= 4096. So I tested this scenario by trimming the count to from 4096 to 1024 bytes and it works fine. count = count > 1024? 1024: count; It tested it on both 32bit and 64bit kernel.
