#include #include #include #include #include #include #include #include "debug.h" #include "tests.h" #include "machine.h" #include "thread_map.h" #include "symbol.h" #include "thread.h" #define THREADS 4 static int go_away; struct thread_data { pthread_t pt; pid_t tid; void *map; int ready[2]; }; static struct thread_data threads[THREADS]; static int thread_init(struct thread_data *td) { void *map; map = mmap(NULL, page_size, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_SHARED|MAP_ANONYMOUS, -1, 0); if (map == MAP_FAILED) { perror("mmap failed"); return -1; } td->map = map; td->tid = syscall(SYS_gettid); pr_debug("tid = %d, map = %p\n", td->tid, map); return 0; } static void *thread_fn(void *arg) { struct thread_data *td = arg; ssize_t ret; int go; if (thread_init(td)) return NULL; /* Signal thread_create thread is initialized. */ ret = write(td->ready[1], &go, sizeof(int)); if (ret != sizeof(int)) { pr_err("failed to notify\n"); return NULL; } while (!go_away) { /* Waiting for main thread to kill us. */ usleep(100); } munmap(td->map, page_size); return NULL; } static int thread_create(int i) { struct thread_data *td = &threads[i]; int err, go; if (pipe(td->ready)) return -1; err = pthread_create(&td->pt, NULL, thread_fn, td); if (!err) { /* Wait for thread initialization. */ ssize_t ret = read(td->ready[0], &go, sizeof(int)); err = ret != sizeof(int); } close(td->ready[0]); close(td->ready[1]); return err; } static int threads_create(void) { struct thread_data *td0 = &threads[0]; int i, err = 0; go_away = 0; /* 0 is main thread */ if (thread_init(td0)) return -1; for (i = 1; !err && i < THREADS; i++) err = thread_create(i); return err; } static int threads_destroy(void) { struct thread_data *td0 = &threads[0]; int i, err = 0; /* cleanup the main thread */ munmap(td0->map, page_size); go_away = 1; for (i = 1; !err && i < THREADS; i++) err = pthread_join(threads[i].pt, NULL); return err; } typedef int (*synth_cb)(struct machine *machine); static int synth_all(struct machine *machine) { return perf_event__synthesize_threads(NULL, perf_event__process, machine, 0, 500); } static int synth_process(struct machine *machine) { struct thread_map *map; int err; map = thread_map__new_by_pid(getpid()); err = perf_event__synthesize_thread_map(NULL, map, perf_event__process, machine, 0, 500); thread_map__put(map); return err; } static int mmap_events(synth_cb synth) { struct machine *machine; int err, i; /* * The threads_create will not return before all threads * are spawned and all created memory map. * * They will loop until threads_destroy is called, so we * can safely run synthesizing function. */ TEST_ASSERT_VAL("failed to create threads", !threads_create()); machine = machine__new_host(); dump_trace = verbose > 1 ? 1 : 0; err = synth(machine); dump_trace = 0; TEST_ASSERT_VAL("failed to destroy threads", !threads_destroy()); TEST_ASSERT_VAL("failed to synthesize maps", !err); /* * All data is synthesized, try to find map for each * thread object. */ for (i = 0; i < THREADS; i++) { struct thread_data *td = &threads[i]; struct addr_location al; struct thread *thread; thread = machine__findnew_thread(machine, getpid(), td->tid); pr_debug("looking for map %p\n", td->map); thread__find_addr_map(thread, PERF_RECORD_MISC_USER, MAP__FUNCTION, (unsigned long) (td->map + 1), &al); thread__put(thread); if (!al.map) { pr_debug("failed, couldn't find map\n"); err = -1; break; } pr_debug("map %p, addr %" PRIx64 "\n", al.map, al.map->start); } machine__delete_threads(machine); machine__delete(machine); return err; } /* * This test creates 'THREADS' number of threads (including * main thread) and each thread creates memory map. * * When threads are created, we synthesize them with both * (separate tests): * perf_event__synthesize_thread_map (process based) * perf_event__synthesize_threads (global) * * We test we can find all memory maps via: * thread__find_addr_map * * by using all thread objects. */ int test__mmap_thread_lookup(int subtest __maybe_unused) { /* perf_event__synthesize_threads synthesize */ TEST_ASSERT_VAL("failed with sythesizing all", !mmap_events(synth_all)); /* perf_event__synthesize_thread_map synthesize */ TEST_ASSERT_VAL("failed with sythesizing process", !mmap_events(synth_process)); return 0; } c899 (patch) treed2c32b7875356357062a0ab67044a4ae7287b689 parent52ace1ef1259e119a24a34b45cb800c4e7529090 (diff)
SMB3: Add mount parameter to allow user to override max credits
Add mount option "max_credits" to allow setting maximum SMB3 credits to any value from 10 to 64000 (default is 32000). This can be useful to workaround servers with problems allocating credits, or to throttle the client to use smaller amount of simultaneous i/o or to workaround server performance issues. Also adds a cap, so that even if the server granted us more than 65000 credits due to a server bug, we would not use that many. Signed-off-by: Steve French <steve.french@primarydata.com>
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