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Note this will not immediately take advantage > of sheaf batching of kfree_rcu() operations due to the maple tree using > call_rcu with custom callbacks. The followup changes to maple tree will > change that and also make use of the prefilled sheaves functionality. > We run will-it-scale-process-mmap2 micro-benchmark as part of our weekly CI for Kernel Performance Regression testing between a stable vs rc kernel. In this week's run we were able to observe severe regression on AMD platforms (Turin and Bergamo) with running the micro-benchmark between the kernels v6.17 and v6.18-rc1 in the range of 12-13% (Turin) and 22-26% (Bergamo). Bisecting further landed me onto this commit (59faa4da7cd4565cbce25358495556b75bb37022) as first bad commit. The following were the machines' configuration and test parameters used:- Model name: AMD EPYC 128-Core Processor [Bergamo] Thread(s) per core: 2 Core(s) per socket: 128 Socket(s): 1 Total online memory: 258G Model name: AMD EPYC 64-Core Processor [Turin] Thread(s) per core: 2 Core(s) per socket: 64 Socket(s): 1 Total online memory: 258G Test params: nr_task: [1 8 64 128 192 256] mode: process test: mmap2 kpi: per_process_ops cpufreq_governor: performance The following are the stats after bisection:- (the KPI used here is per_process_ops) kernel_versions per_process_ops --------------- --------------- v6.17.0 - 258291 v6.18.0-rc1 - 225839 v6.17.0-rc3-59faa4da7 - 212152 v6.17.0-rc3-3accabda4da1(one commit before bad commit) - 265054 Recreation steps: 1) git clone https://github.com/antonblanchard/will-it-scale.git 2) git clone https://github.com/intel/lkp-tests.git 3) cd will-it-scale && git apply lkp-tests/programs/will-it-scale/pkg/will-it-scale.patch 4) make 5) python3 runtest.py mmap2 25 process 0 0 1 8 64 128 192 256 NOTE: [5] is specific to machine's architecture. starting from 1 is the array of no.of tasks that you'd wish to run the testcase which here is no.cores per CCX, per NUMA node/ per Socket, nr_threads. I also ran the micro-benchmark with tools/testing/perf record and following is the collected data:- # perf diff perf.data.old perf.data No kallsyms or vmlinux with build-id 0fc9c7b62ade1502af5d6a060914732523f367ef was found Warning: 43 out of order events recorded. Warning: 54 out of order events recorded. # Event 'cycles:P' # # Baseline Delta Abs Shared Object Symbol # ........ ......... ...................... .............................................. # +51.51% [kernel.kallsyms] [k] native_queued_spin_lock_slowpath +14.39% [kernel.kallsyms] [k] perf_iterate_ctx +2.52% [kernel.kallsyms] [k] unmap_page_range +1.75% [kernel.kallsyms] [k] mas_wr_node_store +1.47% [kernel.kallsyms] [k] __pi_memset +1.38% [kernel.kallsyms] [k] mt_free_rcu +1.36% [kernel.kallsyms] [k] free_pgd_range +1.10% [kernel.kallsyms] [k] __pi_memcpy +0.96% [kernel.kallsyms] [k] __kmem_cache_alloc_bulk +0.92% [kernel.kallsyms] [k] __mmap_region +0.79% [kernel.kallsyms] [k] mas_empty_area_rev +0.74% [kernel.kallsyms] [k] __cond_resched +0.73% [kernel.kallsyms] [k] mas_walk +0.59% [kernel.kallsyms] [k] mas_pop_node +0.57% [kernel.kallsyms] [k] perf_event_mmap_output +0.49% [kernel.kallsyms] [k] mas_find +0.48% [kernel.kallsyms] [k] mas_next_slot +0.46% [kernel.kallsyms] [k] kmem_cache_free +0.42% [kernel.kallsyms] [k] mas_leaf_max_gap +0.42% [kernel.kallsyms] [k] __call_rcu_common.constprop.0 +0.39% [kernel.kallsyms] [k] entry_SYSCALL_64 +0.38% [kernel.kallsyms] [k] mas_prev_slot +0.38% [kernel.kallsyms] [k] kmem_cache_alloc_noprof +0.37% [kernel.kallsyms] [k] mas_store_gfp > Reviewed-by: Sidhartha Kumar > Reviewed-by: Suren Baghdasaryan > Signed-off-by: Vlastimil Babka > --- > lib/maple_tree.c | 9 +++++++-- > 1 file changed, 7 insertions(+), 2 deletions(-) > > diff --git a/lib/maple_tree.c b/lib/maple_tree.c > index 4f0e30b57b0cef9e5cf791f3f64f5898752db402..d034f170ac897341b40cfd050b6aee86b6d2cf60 100644 > --- a/lib/maple_tree.c > +++ b/lib/maple_tree.c > @@ -6040,9 +6040,14 @@ bool mas_nomem(struct ma_state *mas, gfp_t gfp) > > void __init maple_tree_init(void) > { > + struct kmem_cache_args args = { > + .align = sizeof(struct maple_node), > + .sheaf_capacity = 32, > + }; > + > maple_node_cache = kmem_cache_create("maple_node", > - sizeof(struct maple_node), sizeof(struct maple_node), > - SLAB_PANIC, NULL); > + sizeof(struct maple_node), &args, > + SLAB_PANIC); > } > > /** > --- Thanks and Regards Suneeth D