On Sun, 2020-12-20 at 02:23 +0100, Mike Galbraith wrote: > On Sun, 2020-12-20 at 02:22 +0200, Vitaly Wool wrote: > > zsmalloc takes bit spinlock in its _map() callback and releases it > > only in unmap() which is unsafe and leads to zswap complaining > > about scheduling in atomic context. > > > > To fix that and to improve RT properties of zsmalloc, remove that > > bit spinlock completely and use a bit flag instead. > > It also does get_cpu_var() in map(), put_cpu_var() in unmap(). Bah, I forgot to mention the config dependent rwlock, it's held across map()/unmap() as well, so there are two more hurdles, not one. -Mike
