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trace: allow specifying a subset of a group's tpoints

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This patch aims to introduce a change in enabling
tracepoints inside SPDK. Currently every hit tracepoint will
be stored inside an internal buffer, what is inconvenient when
looking for certain information (eg. starting IO to record
some tracepoints, stopping the IO and having the tracepoint
buffer flooded with irrelevant information before copying the
contents connected with IO operations).

The tpoint mask option (-e) has been extended with ':' character.
User may now enter tpoint mask for individual trace points
inside chosen tpoint group.
Example: "-e 0x20:3f", where "0x20" stands for tpoint group,
':' is a separator and "3f" is the tpoint mask.

Change-Id: I2a700aa5a75a6abb409376e8f5c44d5501629877
Signed-off-by: Krzysztof Karas <krzysztof.karas@intel.com>
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/10431
Reviewed-by: Jim Harris <james.r.harris@intel.com>
Reviewed-by: Konrad Sztyber <konrad.sztyber@intel.com>
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Community-CI: Mellanox Build Bot
Community-CI: Broadcom CI <spdk-ci.pdl@broadcom.com>
This commit is contained in:
Krzysztof Karas 2021-12-01 10:23:55 +00:00 committed by Tomasz Zawadzki
parent 3838d4d2c5
commit 8616736318
2 changed files with 46 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

36
lib/event/app.c
View File

@ -367,9 +367,9 @@ static int
app_setup_trace(struct spdk_app_opts *opts)
{
char shm_name[64];
uint64_t tpoint_group_mask;
char *end = NULL, *tpoint_group_mask_str;
char *tpoint_group_str, *tp_g_str;
uint64_t tpoint_group_mask, tpoint_mask = -1ULL;
char *end = NULL, *tpoint_group_mask_str, *tpoint_group_str = NULL;
char *tp_g_str, *tpoint_group, *tpoints;
if (opts->shm_id >= 0) {
snprintf(shm_name, sizeof(shm_name), "/%s_trace.%d", opts->name, opts->shm_id);
@ -394,13 +394,41 @@ app_setup_trace(struct spdk_app_opts *opts)
* to free later, because spdk_strsepq() modifies given char*. */
tp_g_str = tpoint_group_mask_str;
while ((tpoint_group_str = spdk_strsepq(&tpoint_group_mask_str, ",")) != NULL) {
if (strchr(tpoint_group_str, ':')) {
/* Get the tpoint group mask */
tpoint_group = spdk_strsepq(&tpoint_group_str, ":");
/* Get the tpoint mask inside that group */
tpoints = spdk_strsepq(&tpoint_group_str, ":");
errno = 0;
tpoint_group_mask = strtoull(tpoint_group, &end, 16);
if (*end != '\0' || errno) {
break;
}
/* Check if tpoint group mask has only one bit set.
* This is to avoid enabling individual tpoints in
* more than one tracepoint group at once. */
if (!spdk_u64_is_pow2(tpoint_group_mask)) {
SPDK_ERRLOG("Tpoint group mask: %s contains multiple tpoint groups.\n", tpoint_group);
SPDK_ERRLOG("This is not supported, to prevent from activating tpoints by mistake.\n");
break;
}
errno = 0;
tpoint_mask = strtoull(tpoints, &end, 16);
if (*end != '\0' || errno) {
break;
}
} else {
errno = 0;
tpoint_group_mask = strtoull(tpoint_group_str, &end, 16);
if (*end != '\0' || errno) {
break;
}
tpoint_mask = -1ULL;
}
spdk_trace_set_tpoint_group_mask(tpoint_group_mask);
spdk_trace_set_tpoints(spdk_u64log2(tpoint_group_mask), tpoint_mask);
}
if (tpoint_group_str != NULL) {

12
lib/trace/trace_flags.c
View File

@ -222,8 +222,9 @@ spdk_trace_mask_usage(FILE *f, const char *tmask_arg)
{
struct spdk_trace_register_fn *register_fn;
fprintf(f, " %s, --tpoint-group-mask <mask>\n", tmask_arg);
fprintf(f, " tracepoint group mask for spdk trace buffers (default 0x0");
fprintf(f, " %s, --tpoint-group-mask <group-mask>[:<tpoint_mask>]\n", tmask_arg);
fprintf(f, " group_mask - tracepoint group mask ");
fprintf(f, "for spdk trace buffers (default 0x0");
register_fn = g_reg_fn_head;
while (register_fn) {
@ -232,6 +233,13 @@ spdk_trace_mask_usage(FILE *f, const char *tmask_arg)
}
fprintf(f, ", all 0xffff)\n");
fprintf(f, " tpoint_mask - tracepoint mask for enabling individual");
fprintf(f, " tpoints inside a tracepoint group.");
fprintf(f, " First tpoint inside a group can be");
fprintf(f, " enabled by setting tpoint_mask to 1 (e.g. 0x8:1).\n");
fprintf(f, " Masks can be combined (e.g. 0x400,0x8:1).\n");
fprintf(f, " All available tpoints can be found in");
fprintf(f, " /include/spdk_internal/trace_defs.h\n");
}
void