Differential D22586 Diff 67303 sys/tools/smrstress/smrstress.c

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sys/tools/smrstress/smrstress.c

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				#include <sys/param.h>
				#include <sys/systm.h>
				markjUnsubmitted Not Done Inline Actions /sys/tools is just used for stuff relating to kernel build infrastructure. This should really go in /tools/test. markj: /sys/tools is just used for stuff relating to kernel build infrastructure. This should really…
				#include <sys/kernel.h>
				#include <sys/libkern.h>
				#include <sys/module.h>
				#include <sys/mutex.h>
				#include <sys/proc.h>
				#include <sys/kthread.h>
				#include <sys/conf.h>
				#include <sys/mbuf.h>
				#include <sys/smp.h>
				#include <sys/smr.h>

				#include <vm/uma.h>

				#include <machine/stdarg.h>

				static uma_zone_t smrs_zone;
				static smr_t smrs_smr;

				static int smrs_cpus = 32;
				static int smrs_started;
				static int smrs_iterations = 100000;
				static int smrs_failures = 0;
				static volatile int smrs_completed;

				struct smrs {
				int generation;
				volatile u_int count;
				};

				uintptr_t smrs_current;

				static void
				smrs_error(struct smrs smrs, const char fmt, ...)
				{
				va_list ap;

				atomic_add_int(&smrs_failures, 1);
				printf("SMR ERROR: wr_seq %d, rd_seq %d, c_seq %d, generation %d, count %d ",
				smrs_smr->c_global->g_wr_seq, smrs_smr->c_global->g_rd_seq,
				zpcpu_get(smrs_smr)->c_seq, smrs->generation, smrs->count);
				va_start(ap, fmt);
				(void)vprintf(fmt, ap);
				va_end(ap);
				}

				static void
				smrs_read(void)
				{
				struct smrs *cur;
				int cnt;

				/* Wait for the writer to exit. */
				while (smrs_completed == 0) {
				smr_enter(smrs_smr);
				cur = (void *)atomic_load_ptr(&smrs_current);
				if (cur->generation == -1)
				smrs_error(cur, "read early: Use after free!\n");
				atomic_add_int(&cur->count, 1);
				DELAY(100);
				cnt = atomic_fetchadd_int(&cur->count, -1);
				if (cur->generation == -1)
				smrs_error(cur, "read late: Use after free!\n");
				else if (cnt <= 0)
				smrs_error(cur, "Invalid ref\n");
				smr_exit(smrs_smr);
				maybe_yield();
				}
				}

				static void
				smrs_write(void)
				{
				struct smrs *cur;
				int i;

				for (i = 0; i < smrs_iterations; i++) {
				cur = (void *)smrs_current;
				atomic_store_rel_ptr(&smrs_current,
				(uintptr_t)uma_zalloc(smrs_zone, M_WAITOK));
				uma_zfree(smrs_zone, cur);
				}
				}

				static void
				smrs_thread(void *arg)
				{
				int rw = (intptr_t)arg;

				if (rw == 0)
				smrs_write();
				else
				smrs_read();
				atomic_add_int(&smrs_completed, 1);
				}

				static void
				smrs_start(void)
				{
				struct smrs *cur;
				int i;

				smrs_started = smrs_cpus;
				smrs_completed = 0;
				atomic_store_rel_ptr(&smrs_current,
				(uintptr_t)uma_zalloc(smrs_zone, M_WAITOK));
				for (i = 0; i < smrs_started; i++)
				kthread_add((void ()(void ))smrs_thread,
				(void *)(intptr_t)i, curproc, NULL, 0, 0, "smrs-%d", i);

				while (smrs_completed != smrs_started)
				pause("prf", hz/2);

				cur = (void *)smrs_current;
				smrs_current = (uintptr_t)NULL;
				uma_zfree(smrs_zone, cur);

				printf("Completed %d loops with %d failures\n",
				smrs_iterations, smrs_failures);
				}

				static int
				smrs_ctor(void mem, int size, void arg, int flags)
				{
				static int smr_generation = 0;
				struct smrs *smrs = mem;

				if (smrs->generation != -1 && smrs->generation != 0)
				smrs_error(smrs, "ctor: Invalid smr generation on ctor\n");
				else if (smrs->count != 0)
				smrs_error(smrs, "ctor: Invalid count\n");
				smrs->generation = ++smr_generation;

				return (0);
				}


				static void
				smrs_dtor(void mem, int size, void arg)
				{
				struct smrs *smrs = mem;

				if (smrs->generation == -1)
				smrs_error(smrs, "dtor: Invalid generation");
				smrs->generation = -1;
				if (smrs->count != 0)
				smrs_error(smrs, "dtor: Invalid count\n");
				}


				static void
				smrs_init(void)
				{

				smrs_zone = uma_zcreate("smrs", sizeof(struct smrs),
				smrs_ctor, smrs_dtor, NULL, NULL, UMA_ALIGN_PTR,
				UMA_ZONE_SMR \| UMA_ZONE_ZINIT);
				smrs_smr = uma_zone_get_smr(smrs_zone);
				}

				static void
				smrs_fini(void)
				{

				uma_zdestroy(smrs_zone);
				}

				static int
				smrs_modevent(module_t mod, int what, void *arg)
				{

				switch (what) {
				case MOD_LOAD:
				smrs_init();
				smrs_start();
				break;
				case MOD_UNLOAD:
				smrs_fini();
				break;
				default:
				break;
				}
				return (0);
				}

				moduledata_t smrs_meta = {
				"smrstress",
				smrs_modevent,
				NULL
				};
				DECLARE_MODULE(smrstress, smrs_meta, SI_SUB_DRIVERS, SI_ORDER_MIDDLE);
				MODULE_VERSION(smrstress, 1);