On Tue, May 19, 2026 at 11:59:01AM -0400, Eric Chanudet wrote: > Add mem_cgroup_dmem_charge() and mem_cgroup_dmem_uncharge() to allow > dmem pool allocations to optionally be double-charged against the memory > controller. Take the struct cgroup from the dmem pool's css as there is > no convenient object exported to represent these allocations. These will > resolve the effective memory css from that cgroup and perform the > charge. > > Introduce a MEMCG_DMEM stat counter to memory.stat to make the cgroup's > dmem charge visible. > > Signed-off-by: Eric Chanudet <[email protected]> > --- > include/linux/memcontrol.h | 16 ++++++++++++ > mm/memcontrol.c | 65 > ++++++++++++++++++++++++++++++++++++++++++++++ > 2 files changed, 81 insertions(+) > > diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h > index > dc3fa687759b45748b2acee6d7f43da325eb50c1..8e1d49b87fb64e6114f3eb920293e14920290fe7 > 100644 > --- a/include/linux/memcontrol.h > +++ b/include/linux/memcontrol.h > @@ -39,6 +39,7 @@ enum memcg_stat_item { > MEMCG_ZSWAP_B, > MEMCG_ZSWAPPED, > MEMCG_ZSWAP_INCOMP, > + MEMCG_DMEM, > MEMCG_NR_STAT, > }; > > @@ -1872,6 +1873,21 @@ static inline bool > mem_cgroup_zswap_writeback_enabled(struct mem_cgroup *memcg) > } > #endif > > +#if defined(CONFIG_MEMCG) && defined(CONFIG_CGROUP_DMEM) > +bool mem_cgroup_dmem_charge(struct cgroup *cgrp, unsigned int nr_pages, > + gfp_t gfp_mask); > +void mem_cgroup_dmem_uncharge(struct cgroup *cgrp, unsigned int nr_pages); > +#else > +static inline bool mem_cgroup_dmem_charge(struct cgroup *cgrp, > + unsigned int nr_pages, gfp_t gfp_mask)
Please follow Johannes's request to pass the actually memory object instead of naked numbers.
