diff options
Diffstat (limited to 'tests/mtd-tests/flash_speed.c')
| -rw-r--r-- | tests/mtd-tests/flash_speed.c | 126 |
1 files changed, 123 insertions, 3 deletions
diff --git a/tests/mtd-tests/flash_speed.c b/tests/mtd-tests/flash_speed.c index 035768b..0f82047 100644 --- a/tests/mtd-tests/flash_speed.c +++ b/tests/mtd-tests/flash_speed.c @@ -33,6 +33,7 @@ #include <stdlib.h> #include <libmtd.h> #include <getopt.h> +#include <pthread.h> #include <stdio.h> #include <fcntl.h> #include <time.h> @@ -46,7 +47,7 @@ static const char *mtddev; static libmtd_t mtd_desc; static int fd; -static int peb=-1, count=-1, skip=-1, flags=0; +static int peb=-1, count=-1, skip=-1, flags=0, speb=-1; static struct timespec start, finish; static int pgsize, pgcnt; static int goodebcnt; @@ -57,6 +58,7 @@ static const struct option options[] = { { "peb", required_argument, NULL, 'b' }, { "count", required_argument, NULL, 'c' }, { "skip", required_argument, NULL, 's' }, + { "sec-peb", required_argument, NULL, 'k' }, { NULL, 0, NULL, 0 }, }; @@ -69,7 +71,8 @@ static NORETURN void usage(int status) " -b, --peb <num> Start from this physical erase block\n" " -c, --count <num> Number of erase blocks to use (default: all)\n" " -s, --skip <num> Number of blocks to skip\n" - " -d, --destructive Run destructive (erase and write speed) tests\n", + " -d, --destructive Run destructive (erase and write speed) tests\n" + " -k, --sec-peb <num> Start of secondary block to measure RWW latency (requires -d)\n", status==EXIT_SUCCESS ? stdout : stderr); exit(status); } @@ -93,7 +96,7 @@ static void process_options(int argc, char **argv) int c; while (1) { - c = getopt_long(argc, argv, "hb:c:s:d", options, NULL); + c = getopt_long(argc, argv, "hb:c:s:dk:", options, NULL); if (c == -1) break; @@ -126,6 +129,13 @@ static void process_options(int argc, char **argv) goto failmulti; flags |= DESTRUCTIVE; break; + case 'k': + if (speb >= 0) + goto failmulti; + speb = read_num(c, optarg); + if (speb < 0) + goto failarg; + break; default: exit(EXIT_FAILURE); } @@ -144,11 +154,15 @@ static void process_options(int argc, char **argv) skip = 0; if (count < 0) count = 1; + if (speb >= 0 && !(flags & DESTRUCTIVE)) + goto faildestr; return; failmulti: errmsg_die("'-%c' specified more than once!\n", c); failarg: errmsg_die("Invalid argument for '-%c'!\n", c); +faildestr: + errmsg_die("'-k' specified, -d is missing!\n"); } static int write_eraseblock(int ebnum) @@ -320,6 +334,32 @@ static int erase_good_eraseblocks(unsigned int eb, int ebcnt, int ebskip) return err; } +struct thread_arg { + int (*op)(int peb); + int peb; + struct timespec start; + struct timespec finish; +}; + +static void *op_thread(void *ptr) +{ + struct thread_arg *args = ptr; + unsigned long err = 0; + int i; + + start_timing(&args->start); + for (i = 0; i < count; ++i) { + if (bbt[i]) + continue; + err = args->op(args->peb + i * (skip + 1)); + if (err) + break; + } + stop_timing(&args->finish); + + return (void *)err; +} + #define TIME_OP_PER_PEB( op )\ start_timing(&start);\ for (i = 0; i < count; ++i) {\ @@ -470,6 +510,86 @@ int main(int argc, char **argv) } } + /* Write a page and immediately after try to read another page. Report + * the latency difference when performed on different banks (NOR only). + */ + if (speb >= 0 && mtd.subpage_size == 1) { + long duration_w, duration_r, rww_duration_w, rww_latency_end; + long rww_duration_rnw, rww_duration_r_end; + bool rww_r_end_first; + struct thread_arg write_args_peb = { + .op = write_eraseblock, + .peb = peb, + }; + struct thread_arg read_args_speb = { + .op = read_eraseblock, + .peb = speb, + }; + struct sched_param param_write, param_read; + pthread_attr_t attr_write, attr_read; + pthread_t write_thread, read_thread; + void *retval; + + puts("testing read while write latency"); + + /* Change scheduling priorities so that the write thread gets + *scheduled more aggressively than the read thread. + */ + pthread_attr_init(&attr_write); + pthread_attr_setinheritsched(&attr_write, PTHREAD_EXPLICIT_SCHED); + pthread_attr_setschedpolicy(&attr_write, SCHED_FIFO); + param_write.sched_priority = 42; + pthread_attr_setschedparam(&attr_write, ¶m_write); + + pthread_attr_init(&attr_read); + pthread_attr_setinheritsched(&attr_read, PTHREAD_EXPLICIT_SCHED); + pthread_attr_setschedpolicy(&attr_read, SCHED_FIFO); + param_read.sched_priority = 41; + pthread_attr_setschedparam(&attr_read, ¶m_read); + + err = pthread_create(&write_thread, &attr_write, + (void *)op_thread, &write_args_peb); + if (err) { + errmsg("parallel write pthread create failed"); + goto out; + } + + err = pthread_create(&read_thread, &attr_read, + (void *)op_thread, &read_args_speb); + if (err) { + errmsg("parallel read pthread create failed"); + goto out; + } + + pthread_join(read_thread, &retval); + if ((long)retval) { + errmsg("parallel read pthread failed"); + goto out; + } + + pthread_join(write_thread, &retval); + if ((long)retval) { + errmsg("parallel write pthread failed"); + goto out; + } + + rww_duration_w = calc_duration(&write_args_peb.start, + &write_args_peb.finish); + rww_latency_end = calc_duration(&write_args_peb.finish, + &read_args_speb.finish); + rww_r_end_first = rww_latency_end < 0; + if (rww_r_end_first) + rww_duration_rnw = rww_duration_w; + else + rww_duration_rnw = calc_duration(&write_args_peb.start, + &read_args_speb.finish); + + rww_duration_r_end = calc_duration(&write_args_peb.start, + &read_args_speb.finish); + printf("read while write took %ldms, read ended after %ldms\n", + rww_duration_rnw, rww_duration_r_end); + } + puts("finished"); status = EXIT_SUCCESS; out: |