On Mon, Jun 8, 2020 at 4:07 PM Roman Gushchin <guro@xxxxxx> wrote: > > In order to prepare for per-object slab memory accounting, convert > NR_SLAB_RECLAIMABLE and NR_SLAB_UNRECLAIMABLE vmstat items to bytes. > > To make it obvious, rename them to NR_SLAB_RECLAIMABLE_B and > NR_SLAB_UNRECLAIMABLE_B (similar to NR_KERNEL_STACK_KB). > > Internally global and per-node counters are stored in pages, > however memcg and lruvec counters are stored in bytes. > This scheme may look weird, but only for now. As soon as slab > pages will be shared between multiple cgroups, global and > node counters will reflect the total number of slab pages. > However memcg and lruvec counters will be used for per-memcg > slab memory tracking, which will take separate kernel objects > in the account. Keeping global and node counters in pages helps > to avoid additional overhead. > > The size of slab memory shouldn't exceed 4Gb on 32-bit machines, > so it will fit into atomic_long_t we use for vmstats. > > Signed-off-by: Roman Gushchin <guro@xxxxxx> > Acked-by: Johannes Weiner <hannes@xxxxxxxxxxx> > Acked-by: Vlastimil Babka <vbabka@xxxxxxx> Reviewed-by: Shakeel Butt <shakeelb@xxxxxxxxxx>
