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
..
acpi	pci-v5.10-changes	2020-10-22 12:41:00 -07:00
asm-generic	asm-generic: fixes for v5.10	2020-10-30 13:11:46 -07:00
clocksource
crypto
drm	drm: drm_print.h: fix kernel-doc markups	2020-10-27 11:21:39 +01:00
dt-bindings	ARM: Devicetree updates	2020-10-24 10:44:18 -07:00
keys
kunit	kunit: test: fix remaining kernel-doc warnings	2020-10-26 13:23:44 -06:00
kvm	ARM:	2020-10-23 11:17:56 -07:00
linux	bpf: Prepare for memcg-based memory accounting for bpf maps	2020-12-02 18:32:34 -08:00
math-emu
media	ARM: SoC platform updates	2020-10-24 10:33:08 -07:00
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	mm,hwpoison: introduce MF_MSG_UNSPLIT_THP	2020-10-16 11:11:17 -07:00
rdma	RDMA: Add rdma_connect_locked()	2020-10-28 09:14:49 -03:00
scsi	SCSI misc on 20201023	2020-10-23 16:19:02 -07:00
soc	soc/fsl/qbman: Add an argument to signal if NAPI processing is required.	2020-11-03 17:41:03 -08:00
sound	ALSA: make snd_kcontrol_new name a normal string	2020-10-26 20:28:59 +01:00
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	gpu: ipu-v3: remove unused functions	2020-10-26 10:42:38 +01:00
xen	xen: branch for v5.10-rc1c	2020-10-25 10:55:35 -07:00