diff options
Diffstat (limited to 'cmd/zinject/zinject.c')
-rw-r--r-- | cmd/zinject/zinject.c | 108 |
1 files changed, 105 insertions, 3 deletions
diff --git a/cmd/zinject/zinject.c b/cmd/zinject/zinject.c index f64e50462..f355ebd45 100644 --- a/cmd/zinject/zinject.c +++ b/cmd/zinject/zinject.c @@ -20,7 +20,7 @@ */ /* * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. - * Copyright (c) 2012 by Delphix. All rights reserved. + * Copyright (c) 2012, 2015 by Delphix. All rights reserved. */ /* @@ -239,6 +239,38 @@ usage(void) "\tzinject -d device -A <degrade|fault> -D <delay secs> pool\n" "\t\tPerform a specific action on a particular device.\n" "\n" + "\tzinject -d device -D latency:lanes pool\n" + "\n" + "\t\tAdd an artificial delay to IO requests on a particular\n" + "\t\tdevice, such that the requests take a minimum of 'latency'\n" + "\t\tmilliseconds to complete. Each delay has an associated\n" + "\t\tnumber of 'lanes' which defines the number of concurrent\n" + "\t\tIO requests that can be processed.\n" + "\n" + "\t\tFor example, with a single lane delay of 10 ms (-D 10:1),\n" + "\t\tthe device will only be able to service a single IO request\n" + "\t\tat a time with each request taking 10 ms to complete. So,\n" + "\t\tif only a single request is submitted every 10 ms, the\n" + "\t\taverage latency will be 10 ms; but if more than one request\n" + "\t\tis submitted every 10 ms, the average latency will be more\n" + "\t\tthan 10 ms.\n" + "\n" + "\t\tSimilarly, if a delay of 10 ms is specified to have two\n" + "\t\tlanes (-D 10:2), then the device will be able to service\n" + "\t\ttwo requests at a time, each with a minimum latency of\n" + "\t\t10 ms. So, if two requests are submitted every 10 ms, then\n" + "\t\tthe average latency will be 10 ms; but if more than two\n" + "\t\trequests are submitted every 10 ms, the average latency\n" + "\t\twill be more than 10 ms.\n" + "\n" + "\t\tAlso note, these delays are additive. So two invocations\n" + "\t\tof '-D 10:1', is roughly equivalent to a single invocation\n" + "\t\tof '-D 10:2'. This also means, one can specify multiple\n" + "\t\tlanes with differing target latencies. For example, an\n" + "\t\tinvocation of '-D 10:1' followed by '-D 25:2' will\n" + "\t\tcreate 3 lanes on the device; one lane with a latency\n" + "\t\tof 10 ms and two lanes with a 25 ms latency.\n" + "\n" "\tzinject -I [-s <seconds> | -g <txgs>] pool\n" "\t\tCause the pool to stop writing blocks yet not\n" "\t\treport errors for a duration. Simulates buggy hardware\n" @@ -353,6 +385,9 @@ print_device_handler(int id, const char *pool, zinject_record_t *record, if (record->zi_guid == 0 || record->zi_func[0] != '\0') return (0); + if (record->zi_cmd == ZINJECT_DELAY_IO) + return (0); + if (*count == 0) { (void) printf("%3s %-15s %s\n", "ID", "POOL", "GUID"); (void) printf("--- --------------- ----------------\n"); @@ -367,6 +402,35 @@ print_device_handler(int id, const char *pool, zinject_record_t *record, } static int +print_delay_handler(int id, const char *pool, zinject_record_t *record, + void *data) +{ + int *count = data; + + if (record->zi_guid == 0 || record->zi_func[0] != '\0') + return (0); + + if (record->zi_cmd != ZINJECT_DELAY_IO) + return (0); + + if (*count == 0) { + (void) printf("%3s %-15s %-15s %-15s %s\n", + "ID", "POOL", "DELAY (ms)", "LANES", "GUID"); + (void) printf("--- --------------- --------------- " + "--------------- ----------------\n"); + } + + *count += 1; + + (void) printf("%3d %-15s %-15llu %-15llu %llx\n", id, pool, + (u_longlong_t)NSEC2MSEC(record->zi_timer), + (u_longlong_t)record->zi_nlanes, + (u_longlong_t)record->zi_guid); + + return (0); +} + +static int print_panic_handler(int id, const char *pool, zinject_record_t *record, void *data) { @@ -403,6 +467,13 @@ print_all_handlers(void) count = 0; } + (void) iter_handlers(print_delay_handler, &count); + if (count > 0) { + total += count; + (void) printf("\n"); + count = 0; + } + (void) iter_handlers(print_data_handler, &count); if (count > 0) { total += count; @@ -545,6 +616,35 @@ perform_action(const char *pool, zinject_record_t *record, int cmd) return (1); } +static int +parse_delay(char *str, uint64_t *delay, uint64_t *nlanes) +{ + unsigned long scan_delay; + unsigned long scan_nlanes; + + if (sscanf(str, "%lu:%lu", &scan_delay, &scan_nlanes) != 2) + return (1); + + /* + * We explicitly disallow a delay of zero here, because we key + * off this value being non-zero in translate_device(), to + * determine if the fault is a ZINJECT_DELAY_IO fault or not. + */ + if (scan_delay == 0) + return (1); + + /* + * The units for the CLI delay parameter is milliseconds, but + * the data passed to the kernel is interpreted as nanoseconds. + * Thus we scale the milliseconds to nanoseconds here, and this + * nanosecond value is used to pass the delay to the kernel. + */ + *delay = MSEC2NSEC(scan_delay); + *nlanes = scan_nlanes; + + return (0); +} + int main(int argc, char **argv) { @@ -628,8 +728,10 @@ main(int argc, char **argv) break; case 'D': errno = 0; - record.zi_timer = strtoull(optarg, &end, 10); - if (errno != 0 || *end != '\0') { + ret = parse_delay(optarg, &record.zi_timer, + &record.zi_nlanes); + if (ret != 0) { + (void) fprintf(stderr, "invalid i/o delay " "value: '%s'\n", optarg); usage(); |