From: Michal Hocko <mhocko@xxxxxxxx> Subject: mm: clarify __GFP_MEMALLOC usage It seems that the existing documentation is not explicit about the expected usage and potential risks enough. While it is calls out that users have to free memory when using this flag it is not really apparent that users have to careful to not deplete memory reserves and that they should implement some sort of throttling wrt. freeing process. This is partly based on Neil's explanation [1]. Let's also call out that a pre allocated pool allocator should be considered. [1] http://lkml.kernel.org/r/877dz0yxoa.fsf@xxxxxxxxxxxxxxxxxxxxxxxx [akpm@xxxxxxxxxxxxxxxxxxxx: coding style fixes] [mhocko@xxxxxxxxxx: update] Link: http://lkml.kernel.org/r/20200406070137.GC19426@xxxxxxxxxxxxxx Link: http://lkml.kernel.org/r/20200403083543.11552-2-mhocko@xxxxxxxxxx Signed-off-by: Michal Hocko <mhocko@xxxxxxxx> Cc: David Rientjes <rientjes@xxxxxxxxxx> Cc: Joel Fernandes <joel@xxxxxxxxxxxxxxxxx> Cc: Neil Brown <neilb@xxxxxxx> Cc: Paul E. McKenney <paulmck@xxxxxxxxxx> Cc: John Hubbard <jhubbard@xxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- include/linux/gfp.h | 5 +++++ 1 file changed, 5 insertions(+) --- a/include/linux/gfp.h~mm-clarify-__gfp_memalloc-usage +++ a/include/linux/gfp.h @@ -110,6 +110,11 @@ struct vm_area_struct; * the caller guarantees the allocation will allow more memory to be freed * very shortly e.g. process exiting or swapping. Users either should * be the MM or co-ordinating closely with the VM (e.g. swap over NFS). + * Users of this flag have to be extremely careful to not deplete the reserve + * completely and implement a throttling mechanism which controls the + * consumption of the reserve based on the amount of freed memory. + * Usage of a pre-allocated pool (e.g. mempool) should be always considered + * before using this flag. * * %__GFP_NOMEMALLOC is used to explicitly forbid access to emergency reserves. * This takes precedence over the %__GFP_MEMALLOC flag if both are set. _
