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Yan Zhai 59426454b8 bpf: report RCU QS in cpumap kthread 
[ Upstream commit 00bf631224 ]

When there are heavy load, cpumap kernel threads can be busy polling
packets from redirect queues and block out RCU tasks from reaching
quiescent states. It is insufficient to just call cond_resched() in such
context. Periodically raise a consolidated RCU QS before cond_resched
fixes the problem.

Fixes: 6710e11269 ("bpf: introduce new bpf cpu map type BPF_MAP_TYPE_CPUMAP")
Reviewed-by: Jesper Dangaard Brouer <hawk@kernel.org>
Signed-off-by: Yan Zhai <yan@cloudflare.com>
Acked-by: Paul E. McKenney <paulmck@kernel.org>
Acked-by: Jesper Dangaard Brouer <hawk@kernel.org>
Link: https://lore.kernel.org/r/c17b9f1517e19d813da3ede5ed33ee18496bb5d8.1710877680.git.yan@cloudflare.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
 		2024-03-26 18:22:25 -04:00
..
Makefile bpf: Don't rely on GCC __attribute__((optimize)) to disable GCSE 2020-11-18 19:20:26 +01:00
arraymap.c bpf: Add map and need_defer parameters to .map_fd_put_ptr() 2024-02-23 08:24:57 +01:00
bpf_lru_list.c bpf: Address KCSAN report on bpf_lru_list 2023-07-27 08:37:42 +02:00
bpf_lru_list.h bpf: Address KCSAN report on bpf_lru_list 2023-07-27 08:37:42 +02:00
btf.c btf: fix resolving BTF_KIND_VAR after ARRAY, STRUCT, UNION, PTR 2023-03-17 08:32:51 +01:00
cgroup.c bpf: Don't EFAULT for getsockopt with optval=NULL 2023-05-17 11:35:44 +02:00
core.c bpf: Adjust insufficient default bpf_jit_limit 2023-04-05 11:16:37 +02:00
cpumap.c bpf: report RCU QS in cpumap kthread 2024-03-26 18:22:25 -04:00
devmap.c bpf: Fix integer overflow in argument calculation for bpf_map_area_alloc 2021-12-17 10:12:24 +01:00
disasm.c bpf: Introduce BPF nospec instruction for mitigating Spectre v4 2021-09-15 09:47:38 +02:00
disasm.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 295 2019-06-05 17:36:38 +02:00
hashtab.c bpf: Fix hashtab overflow check on 32-bit arches 2024-03-26 18:22:17 -04:00
helpers.c bpf: Mark bpf_spin_{lock,unlock}() helpers with notrace correctly 2024-03-26 18:22:15 -04:00
inode.c bpf: Fix a rcu warning for bpffs map pretty-print 2020-10-01 13:18:19 +02:00
local_storage.c bpf: move memory size checks to bpf_map_charge_init() 2019-05-31 16:52:56 -07:00
lpm_trie.c bpf, lpm: Fix check prefixlen before walking trie 2024-01-25 14:34:24 -08:00
map_in_map.c bpf: Add map and need_defer parameters to .map_fd_put_ptr() 2024-02-23 08:24:57 +01:00
map_in_map.h bpf: Add map and need_defer parameters to .map_fd_put_ptr() 2024-02-23 08:24:57 +01:00
offload.c bpf, offload: Replace bitwise AND by logical AND in bpf_prog_offload_info_fill 2020-02-28 17:22:27 +01:00
percpu_freelist.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 206 2019-05-30 11:29:53 -07:00
percpu_freelist.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 206 2019-05-30 11:29:53 -07:00
queue_stack_maps.c bpf: Avoid deadlock when using queue and stack maps from NMI 2023-10-10 21:46:36 +02:00
reuseport_array.c bpf: move memory size checks to bpf_map_charge_init() 2019-05-31 16:52:56 -07:00
stackmap.c bpf: Fix stackmap overflow check on 32-bit arches 2024-03-26 18:22:17 -04:00
syscall.c bpf: Ensure correct locking around vulnerable function find_vpid() 2022-10-26 13:22:24 +02:00
sysfs_btf.c bpf: Fix sysfs export of empty BTF section 2020-10-14 10:32:58 +02:00
tnum.c bpf: Fix incorrect verifier simulation of ARSH under ALU32 2020-01-23 08:22:44 +01:00
verifier.c bpf: Fix precision tracking for BPF_ALU | BPF_TO_BE | BPF_END 2023-11-28 16:50:18 +00:00
xskmap.c bpf/xskmap: Return ERR_PTR for failure case instead of NULL. 2019-09-25 22:14:16 +02:00