On Mon, 8 Feb 2021 17:50:51 +0000 Chuck Lever <chuck.lever@xxxxxxxxxx> wrote: > Sorry for resending. I misremembered the linux-mm address. > > > Begin forwarded message: > > > > [ please Cc: me, I'm not subscribed to linux-mm ] > > > > We've been discussing how NFSD can more efficiently refill its > > receive buffers (currently alloc_page() in a loop; see > > net/sunrpc/svc_xprt.c::svc_alloc_arg()). > > It looks like you could also take advantage of bulk free in: svc_free_res_pages() I would like to use the page bulk alloc API here: https://github.com/torvalds/linux/blob/master/net/core/page_pool.c#L201-L209 > > Neil Brown pointed me to this old thread: > > > > https://lore.kernel.org/lkml/20170109163518.6001-1-mgorman@xxxxxxxxxxxxxxxxxxx/ > > > > We see that many of the prerequisites are in v5.11-rc, but > > alloc_page_bulk() is not. I tried forward-porting 4/4 in that > > series, but enough internal APIs have changed since 2017 that > > the patch does not come close to applying and compiling. I forgot that this was never merged. It is sad as Mel showed huge improvement with his work. > > I'm wondering: > > > > a) is there a newer version of that work? > > Mel, why was this work never merged upstream? > > b) if not, does there exist a preferred API in 5.11 for bulk > > page allocation? > > > > Many thanks for any guidance! I have a kernel module that micro-bench the API alloc_pages_bulk() here: https://github.com/netoptimizer/prototype-kernel/blob/master/kernel/mm/bench/page_bench04_bulk.c#L97 -- Best regards, Jesper Dangaard Brouer MSc.CS, Principal Kernel Engineer at Red Hat LinkedIn: http://www.linkedin.com/in/brouer
