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Yicong Yang abc8b81b6f dma-mapping: benchmark: Don't starve others when doing the test [ Upstream commit `54624acf88` ] The test thread will start N benchmark kthreads and then schedule out until the test time finished and notify the benchmark kthreads to stop. The benchmark kthreads will keep running until notified to stop. There's a problem with current implementation when the benchmark kthreads number is equal to the CPUs on a non-preemptible kernel: since the scheduler will balance the kthreads across the CPUs and when the test time's out the test thread won't get a chance to be scheduled on any CPU then cannot notify the benchmark kthreads to stop. This can be easily reproduced on a VM (simulated with 16 CPUs) with PREEMPT_VOLUNTARY: estuary:/mnt$ ./dma_map_benchmark -t 16 -s 1 rcu: INFO: rcu_sched self-detected stall on CPU rcu: 10-...!: (5221 ticks this GP) idle=ed24/1/0x4000000000000000 softirq=142/142 fqs=0 rcu: (t=5254 jiffies g=-559 q=45 ncpus=16) rcu: rcu_sched kthread starved for 5255 jiffies! g-559 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=12 rcu: Unless rcu_sched kthread gets sufficient CPU time, OOM is now expected behavior. rcu: RCU grace-period kthread stack dump: task:rcu_sched state:R running task stack:0 pid:16 tgid:16 ppid:2 flags:0x00000008 Call trace __switch_to+0xec/0x138 __schedule+0x2f8/0x1080 schedule+0x30/0x130 schedule_timeout+0xa0/0x188 rcu_gp_fqs_loop+0x128/0x528 rcu_gp_kthread+0x1c8/0x208 kthread+0xec/0xf8 ret_from_fork+0x10/0x20 Sending NMI from CPU 10 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 332 Comm: dma-map-benchma Not tainted 6.10.0-rc1-vanilla-LSE #8 Hardware name: QEMU KVM Virtual Machine, BIOS 0.0.0 02/06/2015 pstate: 20400005 (nzCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : arm_smmu_cmdq_issue_cmdlist+0x218/0x730 lr : arm_smmu_cmdq_issue_cmdlist+0x488/0x730 sp : ffff80008748b630 x29: ffff80008748b630 x28: 0000000000000000 x27: ffff80008748b780 x26: 0000000000000000 x25: 000000000000bc70 x24: 000000000001bc70 x23: ffff0000c12af080 x22: 0000000000010000 x21: 000000000000ffff x20: ffff80008748b700 x19: ffff0000c12af0c0 x18: 0000000000010000 x17: 0000000000000001 x16: 0000000000000040 x15: ffffffffffffffff x14: 0001ffffffffffff x13: 000000000000ffff x12: 00000000000002f1 x11: 000000000001ffff x10: 0000000000000031 x9 : ffff800080b6b0b8 x8 : ffff0000c2a48000 x7 : 000000000001bc71 x6 : 0001800000000000 x5 : 00000000000002f1 x4 : 01ffffffffffffff x3 : 000000000009aaf1 x2 : 0000000000000018 x1 : 000000000000000f x0 : ffff0000c12af18c Call trace: arm_smmu_cmdq_issue_cmdlist+0x218/0x730 __arm_smmu_tlb_inv_range+0xe0/0x1a8 arm_smmu_iotlb_sync+0xc0/0x128 __iommu_dma_unmap+0x248/0x320 iommu_dma_unmap_page+0x5c/0xe8 dma_unmap_page_attrs+0x38/0x1d0 map_benchmark_thread+0x118/0x2c0 kthread+0xec/0xf8 ret_from_fork+0x10/0x20 Solve this by adding scheduling point in the kthread loop, so if there're other threads in the system they may have a chance to run, especially the thread to notify the test end. However this may degrade the test concurrency so it's recommended to run this on an idle system. Signed-off-by: Yicong Yang <yangyicong@hisilicon.com> Acked-by: Barry Song <baohua@kernel.org> Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Sasha Levin <sashal@kernel.org>		2024-09-12 11:11:37 +02:00
arch	um: line: always fill *error_out in setup_one_line()	2024-09-12 11:11:35 +02:00
block	block: remove the blk_flush_integrity call in blk_integrity_unregister	2024-09-08 07:54:47 +02:00
certs
crypto	crypto: aead,cipher - zeroize key buffer after use	2024-07-11 12:49:04 +02:00
Documentation	hwspinlock: Introduce hwspin_lock_bust()	2024-09-08 07:54:43 +02:00
drivers	drm/amdgpu: Set no_hw_access when VF request full GPU fails	2024-09-12 11:11:36 +02:00
fs	jbd2: avoid mount failed when commit block is partial submitted	2024-09-12 11:11:37 +02:00
include	bpf, net: Fix a potential race in do_sock_getsockopt()	2024-09-12 11:11:34 +02:00
init	rust: fix the default format for CONFIG_{RUSTC,BINDGEN}_VERSION_TEXT	2024-08-29 17:33:29 +02:00
io_uring	io_uring: fix io_match_task must_hold	2024-08-03 08:54:41 +02:00
ipc	sysctl: treewide: drop unused argument ctl_table_root::set_ownership(table)	2024-08-11 12:47:13 +02:00
kernel	dma-mapping: benchmark: Don't starve others when doing the test	2024-09-12 11:11:37 +02:00
lib	sched/topology: Handle NUMA_NO_NODE in sched_numa_find_nth_cpu()	2024-08-29 17:33:24 +02:00
LICENSES
mm	userfaultfd: fix checks for huge PMDs	2024-09-12 11:11:27 +02:00
net	net: bridge: br_fdb_external_learn_add(): always set EXT_LEARN	2024-09-12 11:11:35 +02:00
rust	rust: kbuild: fix export of bss symbols	2024-09-12 11:11:32 +02:00
samples	bpf: Replace bpf_lpm_trie_key 0-length array with flexible array	2024-08-19 06:04:27 +02:00
scripts	rust: work around `bindgen` 0.69.0 issue	2024-08-29 17:33:29 +02:00
security	smack: unix sockets: fix accept()ed socket label	2024-09-12 11:11:29 +02:00
sound	ASoc: TAS2781: replace beXX_to_cpup with get_unaligned_beXX for potentially broken alignment	2024-09-12 11:11:36 +02:00
tools	libbpf: Add NULL checks to bpf_object__{prev_map,next_map}	2024-09-12 11:11:36 +02:00
usr
virt	KVM: Fix a data race on last_boosted_vcpu in kvm_vcpu_on_spin()	2024-06-27 13:49:11 +02:00
.clang-format
.cocciconfig
.get_maintainer.ignore
.gitattributes
.gitignore
.mailmap
.rustfmt.toml
COPYING
CREDITS
Kbuild
Kconfig
MAINTAINERS	pwm: Rename pwm_apply_state() to pwm_apply_might_sleep()	2024-06-12 11:12:24 +02:00
Makefile	Linux 6.6.50	2024-09-08 07:54:49 +02:00
README

README

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