Roman Gushchin 48edc1f78a bpf: Prepare for memcg-based memory accounting for bpf maps ... Bpf maps can be updated from an interrupt context and in such case there is no process which can be charged. It makes the memory accounting of bpf maps non-trivial. Fortunately, after commit 4127c6504f ("mm: kmem: enable kernel memcg accounting from interrupt contexts") and commit b87d8cefe4 ("mm, memcg: rework remote charging API to support nesting") it's finally possible. To make the ownership model simple and consistent, when the map is created, the memory cgroup of the current process is recorded. All subsequent allocations related to the bpf map are charged to the same memory cgroup. It includes allocations made by any processes (even if they do belong to a different cgroup) and from interrupts. This commit introduces 3 new helpers, which will be used by following commits to enable the accounting of bpf maps memory: - bpf_map_kmalloc_node() - bpf_map_kzalloc() - bpf_map_alloc_percpu() They are wrapping popular memory allocation functions. They set the active memory cgroup to the map's memory cgroup and add __GFP_ACCOUNT to the passed gfp flags. Then they call into the corresponding memory allocation function and restore the original active memory cgroup. These helpers are supposed to use everywhere except the map creation path. During the map creation when the map structure is allocated by itself, it cannot be passed to those helpers. In those cases default memory allocation function will be used with the __GFP_ACCOUNT flag. Signed-off-by: Roman Gushchin <guro@fb.com> Acked-by: Daniel Borkmann <daniel@iogearbox.net> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Link: https://lore.kernel.org/bpf/20201201215900.3569844-7-guro@fb.com		2020-12-02 18:32:34 -08:00
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acpi
asm-generic
clocksource
crypto
drm
dt-bindings
keys
kunit
kvm
linux	bpf: Prepare for memcg-based memory accounting for bpf maps	2020-12-02 18:32:34 -08:00
math-emu
media
memory
misc
net	net, xdp, xsk: fix __sk_mark_napi_id_once napi_id error	2020-12-01 15:51:19 +01:00
pcmcia
ras
rdma
scsi
soc
sound
target
trace	mm: memcontrol: Use helpers to read page's memcg data	2020-12-02 18:28:05 -08:00
uapi	net: Add SO_BUSY_POLL_BUDGET socket option	2020-12-01 00:09:25 +01:00
vdso
video
xen