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![Paul E. McKenney](/assets/img/avatar_default.png)
This commit adds the desired CPU, the actual CPU, and nr_cpu_ids to the wrong-CPU warning in scftorture_invoker(), the better to help with debugging. Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
608 lines
18 KiB
C
608 lines
18 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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//
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// Torture test for smp_call_function() and friends.
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//
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// Copyright (C) Facebook, 2020.
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//
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// Author: Paul E. McKenney <paulmck@kernel.org>
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#define pr_fmt(fmt) fmt
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#include <linux/atomic.h>
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#include <linux/bitops.h>
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#include <linux/completion.h>
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#include <linux/cpu.h>
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#include <linux/delay.h>
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#include <linux/err.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/kthread.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/notifier.h>
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#include <linux/percpu.h>
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#include <linux/rcupdate.h>
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#include <linux/rcupdate_trace.h>
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#include <linux/reboot.h>
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#include <linux/sched.h>
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#include <linux/spinlock.h>
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#include <linux/smp.h>
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#include <linux/stat.h>
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#include <linux/srcu.h>
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#include <linux/slab.h>
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#include <linux/torture.h>
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#include <linux/types.h>
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#define SCFTORT_STRING "scftorture"
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#define SCFTORT_FLAG SCFTORT_STRING ": "
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#define SCFTORTOUT(s, x...) \
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pr_alert(SCFTORT_FLAG s, ## x)
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#define VERBOSE_SCFTORTOUT(s, x...) \
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do { if (verbose) pr_alert(SCFTORT_FLAG s, ## x); } while (0)
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#define VERBOSE_SCFTORTOUT_ERRSTRING(s, x...) \
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do { if (verbose) pr_alert(SCFTORT_FLAG "!!! " s, ## x); } while (0)
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Paul E. McKenney <paulmck@kernel.org>");
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// Wait until there are multiple CPUs before starting test.
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torture_param(int, holdoff, IS_BUILTIN(CONFIG_SCF_TORTURE_TEST) ? 10 : 0,
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"Holdoff time before test start (s)");
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torture_param(int, longwait, 0, "Include ridiculously long waits? (seconds)");
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torture_param(int, nthreads, -1, "# threads, defaults to -1 for all CPUs.");
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torture_param(int, onoff_holdoff, 0, "Time after boot before CPU hotplugs (s)");
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torture_param(int, onoff_interval, 0, "Time between CPU hotplugs (s), 0=disable");
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torture_param(int, shutdown_secs, 0, "Shutdown time (ms), <= zero to disable.");
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torture_param(int, stat_interval, 60, "Number of seconds between stats printk()s.");
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torture_param(int, stutter, 5, "Number of jiffies to run/halt test, 0=disable");
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torture_param(bool, use_cpus_read_lock, 0, "Use cpus_read_lock() to exclude CPU hotplug.");
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torture_param(int, verbose, 0, "Enable verbose debugging printk()s");
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torture_param(int, weight_resched, -1, "Testing weight for resched_cpu() operations.");
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torture_param(int, weight_single, -1, "Testing weight for single-CPU no-wait operations.");
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torture_param(int, weight_single_wait, -1, "Testing weight for single-CPU operations.");
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torture_param(int, weight_many, -1, "Testing weight for multi-CPU no-wait operations.");
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torture_param(int, weight_many_wait, -1, "Testing weight for multi-CPU operations.");
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torture_param(int, weight_all, -1, "Testing weight for all-CPU no-wait operations.");
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torture_param(int, weight_all_wait, -1, "Testing weight for all-CPU operations.");
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char *torture_type = "";
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#ifdef MODULE
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# define SCFTORT_SHUTDOWN 0
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#else
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# define SCFTORT_SHUTDOWN 1
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#endif
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torture_param(bool, shutdown, SCFTORT_SHUTDOWN, "Shutdown at end of torture test.");
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struct scf_statistics {
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struct task_struct *task;
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int cpu;
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long long n_resched;
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long long n_single;
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long long n_single_ofl;
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long long n_single_wait;
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long long n_single_wait_ofl;
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long long n_many;
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long long n_many_wait;
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long long n_all;
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long long n_all_wait;
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};
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static struct scf_statistics *scf_stats_p;
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static struct task_struct *scf_torture_stats_task;
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static DEFINE_PER_CPU(long long, scf_invoked_count);
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// Data for random primitive selection
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#define SCF_PRIM_RESCHED 0
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#define SCF_PRIM_SINGLE 1
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#define SCF_PRIM_MANY 2
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#define SCF_PRIM_ALL 3
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#define SCF_NPRIMS 7 // Need wait and no-wait versions of each,
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// except for SCF_PRIM_RESCHED.
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static char *scf_prim_name[] = {
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"resched_cpu",
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"smp_call_function_single",
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"smp_call_function_many",
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"smp_call_function",
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};
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struct scf_selector {
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unsigned long scfs_weight;
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int scfs_prim;
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bool scfs_wait;
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};
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static struct scf_selector scf_sel_array[SCF_NPRIMS];
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static int scf_sel_array_len;
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static unsigned long scf_sel_totweight;
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// Communicate between caller and handler.
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struct scf_check {
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bool scfc_in;
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bool scfc_out;
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int scfc_cpu; // -1 for not _single().
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bool scfc_wait;
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};
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// Use to wait for all threads to start.
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static atomic_t n_started;
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static atomic_t n_errs;
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static atomic_t n_mb_in_errs;
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static atomic_t n_mb_out_errs;
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static atomic_t n_alloc_errs;
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static bool scfdone;
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static char *bangstr = "";
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static DEFINE_TORTURE_RANDOM_PERCPU(scf_torture_rand);
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extern void resched_cpu(int cpu); // An alternative IPI vector.
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// Print torture statistics. Caller must ensure serialization.
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static void scf_torture_stats_print(void)
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{
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int cpu;
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int i;
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long long invoked_count = 0;
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bool isdone = READ_ONCE(scfdone);
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struct scf_statistics scfs = {};
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for_each_possible_cpu(cpu)
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invoked_count += data_race(per_cpu(scf_invoked_count, cpu));
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for (i = 0; i < nthreads; i++) {
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scfs.n_resched += scf_stats_p[i].n_resched;
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scfs.n_single += scf_stats_p[i].n_single;
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scfs.n_single_ofl += scf_stats_p[i].n_single_ofl;
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scfs.n_single_wait += scf_stats_p[i].n_single_wait;
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scfs.n_single_wait_ofl += scf_stats_p[i].n_single_wait_ofl;
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scfs.n_many += scf_stats_p[i].n_many;
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scfs.n_many_wait += scf_stats_p[i].n_many_wait;
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scfs.n_all += scf_stats_p[i].n_all;
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scfs.n_all_wait += scf_stats_p[i].n_all_wait;
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}
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if (atomic_read(&n_errs) || atomic_read(&n_mb_in_errs) ||
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atomic_read(&n_mb_out_errs) || atomic_read(&n_alloc_errs))
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bangstr = "!!! ";
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pr_alert("%s %sscf_invoked_count %s: %lld resched: %lld single: %lld/%lld single_ofl: %lld/%lld many: %lld/%lld all: %lld/%lld ",
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SCFTORT_FLAG, bangstr, isdone ? "VER" : "ver", invoked_count, scfs.n_resched,
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scfs.n_single, scfs.n_single_wait, scfs.n_single_ofl, scfs.n_single_wait_ofl,
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scfs.n_many, scfs.n_many_wait, scfs.n_all, scfs.n_all_wait);
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torture_onoff_stats();
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pr_cont("ste: %d stnmie: %d stnmoe: %d staf: %d\n", atomic_read(&n_errs),
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atomic_read(&n_mb_in_errs), atomic_read(&n_mb_out_errs),
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atomic_read(&n_alloc_errs));
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}
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// Periodically prints torture statistics, if periodic statistics printing
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// was specified via the stat_interval module parameter.
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static int
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scf_torture_stats(void *arg)
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{
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VERBOSE_TOROUT_STRING("scf_torture_stats task started");
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do {
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schedule_timeout_interruptible(stat_interval * HZ);
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scf_torture_stats_print();
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torture_shutdown_absorb("scf_torture_stats");
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} while (!torture_must_stop());
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torture_kthread_stopping("scf_torture_stats");
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return 0;
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}
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// Add a primitive to the scf_sel_array[].
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static void scf_sel_add(unsigned long weight, int prim, bool wait)
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{
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struct scf_selector *scfsp = &scf_sel_array[scf_sel_array_len];
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// If no weight, if array would overflow, if computing three-place
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// percentages would overflow, or if the scf_prim_name[] array would
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// overflow, don't bother. In the last three two cases, complain.
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if (!weight ||
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WARN_ON_ONCE(scf_sel_array_len >= ARRAY_SIZE(scf_sel_array)) ||
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WARN_ON_ONCE(0 - 100000 * weight <= 100000 * scf_sel_totweight) ||
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WARN_ON_ONCE(prim >= ARRAY_SIZE(scf_prim_name)))
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return;
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scf_sel_totweight += weight;
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scfsp->scfs_weight = scf_sel_totweight;
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scfsp->scfs_prim = prim;
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scfsp->scfs_wait = wait;
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scf_sel_array_len++;
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}
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// Dump out weighting percentages for scf_prim_name[] array.
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static void scf_sel_dump(void)
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{
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int i;
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unsigned long oldw = 0;
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struct scf_selector *scfsp;
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unsigned long w;
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for (i = 0; i < scf_sel_array_len; i++) {
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scfsp = &scf_sel_array[i];
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w = (scfsp->scfs_weight - oldw) * 100000 / scf_sel_totweight;
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pr_info("%s: %3lu.%03lu %s(%s)\n", __func__, w / 1000, w % 1000,
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scf_prim_name[scfsp->scfs_prim],
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scfsp->scfs_wait ? "wait" : "nowait");
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oldw = scfsp->scfs_weight;
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}
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}
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// Randomly pick a primitive and wait/nowait, based on weightings.
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static struct scf_selector *scf_sel_rand(struct torture_random_state *trsp)
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{
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int i;
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unsigned long w = torture_random(trsp) % (scf_sel_totweight + 1);
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for (i = 0; i < scf_sel_array_len; i++)
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if (scf_sel_array[i].scfs_weight >= w)
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return &scf_sel_array[i];
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WARN_ON_ONCE(1);
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return &scf_sel_array[0];
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}
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// Update statistics and occasionally burn up mass quantities of CPU time,
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// if told to do so via scftorture.longwait. Otherwise, occasionally burn
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// a little bit.
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static void scf_handler(void *scfc_in)
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{
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int i;
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int j;
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unsigned long r = torture_random(this_cpu_ptr(&scf_torture_rand));
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struct scf_check *scfcp = scfc_in;
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if (likely(scfcp)) {
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WRITE_ONCE(scfcp->scfc_out, false); // For multiple receivers.
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if (WARN_ON_ONCE(unlikely(!READ_ONCE(scfcp->scfc_in))))
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atomic_inc(&n_mb_in_errs);
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}
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this_cpu_inc(scf_invoked_count);
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if (longwait <= 0) {
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if (!(r & 0xffc0))
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udelay(r & 0x3f);
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goto out;
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}
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if (r & 0xfff)
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goto out;
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r = (r >> 12);
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if (longwait <= 0) {
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udelay((r & 0xff) + 1);
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goto out;
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}
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r = r % longwait + 1;
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for (i = 0; i < r; i++) {
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for (j = 0; j < 1000; j++) {
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udelay(1000);
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cpu_relax();
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}
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}
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out:
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if (unlikely(!scfcp))
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return;
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if (scfcp->scfc_wait)
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WRITE_ONCE(scfcp->scfc_out, true);
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else
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kfree(scfcp);
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}
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// As above, but check for correct CPU.
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static void scf_handler_1(void *scfc_in)
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{
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struct scf_check *scfcp = scfc_in;
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if (likely(scfcp) && WARN_ONCE(smp_processor_id() != scfcp->scfc_cpu, "%s: Wanted CPU %d got CPU %d\n", __func__, scfcp->scfc_cpu, smp_processor_id())) {
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atomic_inc(&n_errs);
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}
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scf_handler(scfcp);
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}
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// Randomly do an smp_call_function*() invocation.
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static void scftorture_invoke_one(struct scf_statistics *scfp, struct torture_random_state *trsp)
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{
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uintptr_t cpu;
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int ret = 0;
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struct scf_check *scfcp = NULL;
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struct scf_selector *scfsp = scf_sel_rand(trsp);
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if (use_cpus_read_lock)
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cpus_read_lock();
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else
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preempt_disable();
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if (scfsp->scfs_prim == SCF_PRIM_SINGLE || scfsp->scfs_wait) {
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scfcp = kmalloc(sizeof(*scfcp), GFP_ATOMIC);
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if (WARN_ON_ONCE(!scfcp)) {
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atomic_inc(&n_alloc_errs);
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} else {
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scfcp->scfc_cpu = -1;
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scfcp->scfc_wait = scfsp->scfs_wait;
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scfcp->scfc_out = false;
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}
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}
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switch (scfsp->scfs_prim) {
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case SCF_PRIM_RESCHED:
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if (IS_BUILTIN(CONFIG_SCF_TORTURE_TEST)) {
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cpu = torture_random(trsp) % nr_cpu_ids;
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scfp->n_resched++;
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resched_cpu(cpu);
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}
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break;
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case SCF_PRIM_SINGLE:
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cpu = torture_random(trsp) % nr_cpu_ids;
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if (scfsp->scfs_wait)
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scfp->n_single_wait++;
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else
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scfp->n_single++;
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if (scfcp) {
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scfcp->scfc_cpu = cpu;
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barrier(); // Prevent race-reduction compiler optimizations.
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scfcp->scfc_in = true;
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}
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ret = smp_call_function_single(cpu, scf_handler_1, (void *)scfcp, scfsp->scfs_wait);
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if (ret) {
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if (scfsp->scfs_wait)
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scfp->n_single_wait_ofl++;
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else
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scfp->n_single_ofl++;
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kfree(scfcp);
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scfcp = NULL;
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}
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break;
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case SCF_PRIM_MANY:
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if (scfsp->scfs_wait)
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scfp->n_many_wait++;
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else
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scfp->n_many++;
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if (scfcp) {
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barrier(); // Prevent race-reduction compiler optimizations.
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scfcp->scfc_in = true;
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}
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smp_call_function_many(cpu_online_mask, scf_handler, scfcp, scfsp->scfs_wait);
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break;
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case SCF_PRIM_ALL:
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if (scfsp->scfs_wait)
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scfp->n_all_wait++;
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else
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scfp->n_all++;
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if (scfcp) {
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barrier(); // Prevent race-reduction compiler optimizations.
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scfcp->scfc_in = true;
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}
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smp_call_function(scf_handler, scfcp, scfsp->scfs_wait);
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break;
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default:
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WARN_ON_ONCE(1);
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if (scfcp)
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scfcp->scfc_out = true;
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}
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if (scfcp && scfsp->scfs_wait) {
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if (WARN_ON_ONCE((num_online_cpus() > 1 || scfsp->scfs_prim == SCF_PRIM_SINGLE) &&
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!scfcp->scfc_out))
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atomic_inc(&n_mb_out_errs); // Leak rather than trash!
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else
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kfree(scfcp);
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barrier(); // Prevent race-reduction compiler optimizations.
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}
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if (use_cpus_read_lock)
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cpus_read_unlock();
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else
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preempt_enable();
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if (!(torture_random(trsp) & 0xfff))
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schedule_timeout_uninterruptible(1);
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}
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// SCF test kthread. Repeatedly does calls to members of the
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// smp_call_function() family of functions.
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static int scftorture_invoker(void *arg)
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{
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int cpu;
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int curcpu;
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DEFINE_TORTURE_RANDOM(rand);
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struct scf_statistics *scfp = (struct scf_statistics *)arg;
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bool was_offline = false;
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VERBOSE_SCFTORTOUT("scftorture_invoker %d: task started", scfp->cpu);
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cpu = scfp->cpu % nr_cpu_ids;
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set_cpus_allowed_ptr(current, cpumask_of(cpu));
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set_user_nice(current, MAX_NICE);
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if (holdoff)
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schedule_timeout_interruptible(holdoff * HZ);
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VERBOSE_SCFTORTOUT("scftorture_invoker %d: Waiting for all SCF torturers from cpu %d", scfp->cpu, smp_processor_id());
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// Make sure that the CPU is affinitized appropriately during testing.
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curcpu = smp_processor_id();
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WARN_ONCE(curcpu != scfp->cpu % nr_cpu_ids,
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"%s: Wanted CPU %d, running on %d, nr_cpu_ids = %d\n",
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__func__, scfp->cpu, curcpu, nr_cpu_ids);
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if (!atomic_dec_return(&n_started))
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while (atomic_read_acquire(&n_started)) {
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if (torture_must_stop()) {
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VERBOSE_SCFTORTOUT("scftorture_invoker %d ended before starting", scfp->cpu);
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goto end;
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}
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schedule_timeout_uninterruptible(1);
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}
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VERBOSE_SCFTORTOUT("scftorture_invoker %d started", scfp->cpu);
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do {
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scftorture_invoke_one(scfp, &rand);
|
|
while (cpu_is_offline(cpu) && !torture_must_stop()) {
|
|
schedule_timeout_interruptible(HZ / 5);
|
|
was_offline = true;
|
|
}
|
|
if (was_offline) {
|
|
set_cpus_allowed_ptr(current, cpumask_of(cpu));
|
|
was_offline = false;
|
|
}
|
|
cond_resched();
|
|
stutter_wait("scftorture_invoker");
|
|
} while (!torture_must_stop());
|
|
|
|
VERBOSE_SCFTORTOUT("scftorture_invoker %d ended", scfp->cpu);
|
|
end:
|
|
torture_kthread_stopping("scftorture_invoker");
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
scftorture_print_module_parms(const char *tag)
|
|
{
|
|
pr_alert(SCFTORT_FLAG
|
|
"--- %s: verbose=%d holdoff=%d longwait=%d nthreads=%d onoff_holdoff=%d onoff_interval=%d shutdown_secs=%d stat_interval=%d stutter=%d use_cpus_read_lock=%d, weight_resched=%d, weight_single=%d, weight_single_wait=%d, weight_many=%d, weight_many_wait=%d, weight_all=%d, weight_all_wait=%d\n", tag,
|
|
verbose, holdoff, longwait, nthreads, onoff_holdoff, onoff_interval, shutdown, stat_interval, stutter, use_cpus_read_lock, weight_resched, weight_single, weight_single_wait, weight_many, weight_many_wait, weight_all, weight_all_wait);
|
|
}
|
|
|
|
static void scf_cleanup_handler(void *unused)
|
|
{
|
|
}
|
|
|
|
static void scf_torture_cleanup(void)
|
|
{
|
|
int i;
|
|
|
|
if (torture_cleanup_begin())
|
|
return;
|
|
|
|
WRITE_ONCE(scfdone, true);
|
|
if (nthreads)
|
|
for (i = 0; i < nthreads; i++)
|
|
torture_stop_kthread("scftorture_invoker", scf_stats_p[i].task);
|
|
else
|
|
goto end;
|
|
smp_call_function(scf_cleanup_handler, NULL, 0);
|
|
torture_stop_kthread(scf_torture_stats, scf_torture_stats_task);
|
|
scf_torture_stats_print(); // -After- the stats thread is stopped!
|
|
kfree(scf_stats_p); // -After- the last stats print has completed!
|
|
scf_stats_p = NULL;
|
|
|
|
if (atomic_read(&n_errs) || atomic_read(&n_mb_in_errs) || atomic_read(&n_mb_out_errs))
|
|
scftorture_print_module_parms("End of test: FAILURE");
|
|
else if (torture_onoff_failures())
|
|
scftorture_print_module_parms("End of test: LOCK_HOTPLUG");
|
|
else
|
|
scftorture_print_module_parms("End of test: SUCCESS");
|
|
|
|
end:
|
|
torture_cleanup_end();
|
|
}
|
|
|
|
static int __init scf_torture_init(void)
|
|
{
|
|
long i;
|
|
int firsterr = 0;
|
|
unsigned long weight_resched1 = weight_resched;
|
|
unsigned long weight_single1 = weight_single;
|
|
unsigned long weight_single_wait1 = weight_single_wait;
|
|
unsigned long weight_many1 = weight_many;
|
|
unsigned long weight_many_wait1 = weight_many_wait;
|
|
unsigned long weight_all1 = weight_all;
|
|
unsigned long weight_all_wait1 = weight_all_wait;
|
|
|
|
if (!torture_init_begin(SCFTORT_STRING, verbose))
|
|
return -EBUSY;
|
|
|
|
scftorture_print_module_parms("Start of test");
|
|
|
|
if (weight_resched == -1 && weight_single == -1 && weight_single_wait == -1 &&
|
|
weight_many == -1 && weight_many_wait == -1 &&
|
|
weight_all == -1 && weight_all_wait == -1) {
|
|
weight_resched1 = 2 * nr_cpu_ids;
|
|
weight_single1 = 2 * nr_cpu_ids;
|
|
weight_single_wait1 = 2 * nr_cpu_ids;
|
|
weight_many1 = 2;
|
|
weight_many_wait1 = 2;
|
|
weight_all1 = 1;
|
|
weight_all_wait1 = 1;
|
|
} else {
|
|
if (weight_resched == -1)
|
|
weight_resched1 = 0;
|
|
if (weight_single == -1)
|
|
weight_single1 = 0;
|
|
if (weight_single_wait == -1)
|
|
weight_single_wait1 = 0;
|
|
if (weight_many == -1)
|
|
weight_many1 = 0;
|
|
if (weight_many_wait == -1)
|
|
weight_many_wait1 = 0;
|
|
if (weight_all == -1)
|
|
weight_all1 = 0;
|
|
if (weight_all_wait == -1)
|
|
weight_all_wait1 = 0;
|
|
}
|
|
if (weight_single1 == 0 && weight_single_wait1 == 0 &&
|
|
weight_many1 == 0 && weight_many_wait1 == 0 &&
|
|
weight_all1 == 0 && weight_all_wait1 == 0) {
|
|
VERBOSE_SCFTORTOUT_ERRSTRING("all zero weights makes no sense");
|
|
firsterr = -EINVAL;
|
|
goto unwind;
|
|
}
|
|
if (IS_BUILTIN(CONFIG_SCF_TORTURE_TEST))
|
|
scf_sel_add(weight_resched1, SCF_PRIM_RESCHED, false);
|
|
else if (weight_resched1)
|
|
VERBOSE_SCFTORTOUT_ERRSTRING("built as module, weight_resched ignored");
|
|
scf_sel_add(weight_single1, SCF_PRIM_SINGLE, false);
|
|
scf_sel_add(weight_single_wait1, SCF_PRIM_SINGLE, true);
|
|
scf_sel_add(weight_many1, SCF_PRIM_MANY, false);
|
|
scf_sel_add(weight_many_wait1, SCF_PRIM_MANY, true);
|
|
scf_sel_add(weight_all1, SCF_PRIM_ALL, false);
|
|
scf_sel_add(weight_all_wait1, SCF_PRIM_ALL, true);
|
|
scf_sel_dump();
|
|
|
|
if (onoff_interval > 0) {
|
|
firsterr = torture_onoff_init(onoff_holdoff * HZ, onoff_interval, NULL);
|
|
if (firsterr)
|
|
goto unwind;
|
|
}
|
|
if (shutdown_secs > 0) {
|
|
firsterr = torture_shutdown_init(shutdown_secs, scf_torture_cleanup);
|
|
if (firsterr)
|
|
goto unwind;
|
|
}
|
|
if (stutter > 0) {
|
|
firsterr = torture_stutter_init(stutter, stutter);
|
|
if (firsterr)
|
|
goto unwind;
|
|
}
|
|
|
|
// Worker tasks invoking smp_call_function().
|
|
if (nthreads < 0)
|
|
nthreads = num_online_cpus();
|
|
scf_stats_p = kcalloc(nthreads, sizeof(scf_stats_p[0]), GFP_KERNEL);
|
|
if (!scf_stats_p) {
|
|
VERBOSE_SCFTORTOUT_ERRSTRING("out of memory");
|
|
firsterr = -ENOMEM;
|
|
goto unwind;
|
|
}
|
|
|
|
VERBOSE_SCFTORTOUT("Starting %d smp_call_function() threads\n", nthreads);
|
|
|
|
atomic_set(&n_started, nthreads);
|
|
for (i = 0; i < nthreads; i++) {
|
|
scf_stats_p[i].cpu = i;
|
|
firsterr = torture_create_kthread(scftorture_invoker, (void *)&scf_stats_p[i],
|
|
scf_stats_p[i].task);
|
|
if (firsterr)
|
|
goto unwind;
|
|
}
|
|
if (stat_interval > 0) {
|
|
firsterr = torture_create_kthread(scf_torture_stats, NULL, scf_torture_stats_task);
|
|
if (firsterr)
|
|
goto unwind;
|
|
}
|
|
|
|
torture_init_end();
|
|
return 0;
|
|
|
|
unwind:
|
|
torture_init_end();
|
|
scf_torture_cleanup();
|
|
return firsterr;
|
|
}
|
|
|
|
module_init(scf_torture_init);
|
|
module_exit(scf_torture_cleanup);
|