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selftests/bpf: handle missing records in comparison mode better in veristat

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When comparing two datasets, if either side is missing corresponding
record with the same file and prog name, currently veristat emits
misleading zeros/failures, and even tried to calculate a difference,
even though there is no data to compare against.

This patch improves internal logic of handling such situations. Now
we'll emit "N/A" in places where data is missing and comparison is
non-sensical.

As an example, in an artificially truncated and mismatched Cilium
results, the output looks like below:

  $ ./veristat -e file,prog,verdict,insns -C ~/base.csv ~/comp.csv
  File                Program                         Verdict (A)  Verdict (B)  Verdict (DIFF)  Insns (A)  Insns (B)  Insns   (DIFF)
  ------------------  ------------------------------  -----------  -----------  --------------  ---------  ---------  --------------
  bpf_alignchecker.o  __send_drop_notify              success      N/A          N/A                    53        N/A             N/A
  bpf_alignchecker.o  tail_icmp6_handle_ns            failure      failure      MATCH                  33         33     +0 (+0.00%)
  bpf_alignchecker.o  tail_icmp6_send_echo_reply      N/A          failure      N/A                   N/A         74             N/A
  bpf_host.o          __send_drop_notify              success      N/A          N/A                    53        N/A             N/A
  bpf_host.o          cil_from_host                   success      N/A          N/A                   762        N/A             N/A
  bpf_xdp.o           __send_drop_notify              success      success      MATCH                 151        151     +0 (+0.00%)
  bpf_xdp.o           cil_xdp_entry                   success      success      MATCH                 423        423     +0 (+0.00%)
  bpf_xdp.o           tail_handle_nat_fwd_ipv4        success      success      MATCH               21547      20920   -627 (-2.91%)
  bpf_xdp.o           tail_handle_nat_fwd_ipv6        success      success      MATCH               16974      17039    +65 (+0.38%)
  bpf_xdp.o           tail_lb_ipv4                    success      success      MATCH               71736      73430  +1694 (+2.36%)
  bpf_xdp.o           tail_lb_ipv6                    N/A          success      N/A                   N/A     151895             N/A
  bpf_xdp.o           tail_nodeport_ipv4_dsr          N/A          success      N/A                   N/A       1162             N/A
  bpf_xdp.o           tail_nodeport_ipv6_dsr          N/A          success      N/A                   N/A       1206             N/A
  bpf_xdp.o           tail_nodeport_nat_egress_ipv4   N/A          success      N/A                   N/A      15619             N/A
  bpf_xdp.o           tail_nodeport_nat_ingress_ipv4  success      success      MATCH                7658       7713    +55 (+0.72%)
  bpf_xdp.o           tail_nodeport_nat_ingress_ipv6  success      success      MATCH                6405       6397     -8 (-0.12%)
  bpf_xdp.o           tail_nodeport_nat_ipv6_egress   failure      failure      MATCH                 752        752     +0 (+0.00%)
  bpf_xdp.o           tail_rev_nodeport_lb4           success      success      MATCH                7126       6934   -192 (-2.69%)
  bpf_xdp.o           tail_rev_nodeport_lb6           success      success      MATCH               17954      17905    -49 (-0.27%)
  ------------------  ------------------------------  -----------  -----------  --------------  ---------  ---------  --------------

Internally veristat now separates joining two datasets and remembering the
join, and actually emitting a comparison view. This will come handy when we add
support for filtering and custom ordering in comparison mode.

Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/r/20221103055304.2904589-9-andrii@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Andrii Nakryiko 2022-11-02 22:53:02 -07:00 committed by Alexei Starovoitov
parent 77534401d6
commit a5710848d8
1 changed files with 110 additions and 37 deletions
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147
tools/testing/selftests/bpf/veristat.c
View file

@ -41,6 +41,15 @@ struct verif_stats {
long stats[NUM_STATS_CNT];
};
/* joined comparison mode stats */
struct verif_stats_join {
char *file_name;
char *prog_name;
const struct verif_stats *stats_a;
const struct verif_stats *stats_b;
};
struct stat_specs {
int spec_cnt;
enum stat_id ids[ALL_STATS_CNT];
@ -97,6 +106,9 @@ static struct env {
struct verif_stats *baseline_stats;
int baseline_stat_cnt;
struct verif_stats_join *join_stats;
int join_stat_cnt;
struct stat_specs output_spec;
struct stat_specs sort_spec;
@ -518,6 +530,15 @@ static const struct stat_specs default_sort_spec = {
.asc = { true, true, },
};
/* sorting for comparison mode to join two data sets */
static const struct stat_specs join_sort_spec = {
.spec_cnt = 2,
.ids = {
FILE_NAME, PROG_NAME,
},
.asc = { true, true, },
};
static struct stat_def {
const char *header;
const char *names[4];
@ -934,13 +955,16 @@ static void prepare_value(const struct verif_stats *s, enum stat_id id,
{
switch (id) {
case FILE_NAME:
*str = s->file_name;
*str = s ? s->file_name : "N/A";
break;
case PROG_NAME:
*str = s->prog_name;
*str = s ? s->prog_name : "N/A";
break;
case VERDICT:
*str = s->stats[VERDICT] ? "success" : "failure";
if (!s)
*str = "N/A";
else
*str = s->stats[VERDICT] ? "success" : "failure";
break;
case DURATION:
case TOTAL_INSNS:
@ -948,7 +972,7 @@ static void prepare_value(const struct verif_stats *s, enum stat_id id,
case PEAK_STATES:
case MAX_STATES_PER_INSN:
case MARK_READ_MAX_LEN:
*val = s->stats[id];
*val = s ? s->stats[id] : 0;
break;
default:
fprintf(stderr, "Unrecognized stat #%d\n", id);
@ -1223,9 +1247,11 @@ static void output_comp_headers(enum resfmt fmt)
output_comp_header_underlines();
}
static void output_comp_stats(const struct verif_stats *base, const struct verif_stats *comp,
static void output_comp_stats(const struct verif_stats_join *join_stats,
enum resfmt fmt, bool last)
{
const struct verif_stats *base = join_stats->stats_a;
const struct verif_stats *comp = join_stats->stats_b;
char base_buf[1024] = {}, comp_buf[1024] = {}, diff_buf[1024] = {};
int i;
@ -1243,33 +1269,45 @@ static void output_comp_stats(const struct verif_stats *base, const struct verif
/* normalize all the outputs to be in string buffers for simplicity */
if (is_key_stat(id)) {
/* key stats (file and program name) are always strings */
if (base != &fallback_stats)
if (base)
snprintf(base_buf, sizeof(base_buf), "%s", base_str);
else
snprintf(base_buf, sizeof(base_buf), "%s", comp_str);
} else if (base_str) {
snprintf(base_buf, sizeof(base_buf), "%s", base_str);
snprintf(comp_buf, sizeof(comp_buf), "%s", comp_str);
if (strcmp(base_str, comp_str) == 0)
if (!base || !comp)
snprintf(diff_buf, sizeof(diff_buf), "%s", "N/A");
else if (strcmp(base_str, comp_str) == 0)
snprintf(diff_buf, sizeof(diff_buf), "%s", "MATCH");
else
snprintf(diff_buf, sizeof(diff_buf), "%s", "MISMATCH");
} else {
double p = 0.0;
snprintf(base_buf, sizeof(base_buf), "%ld", base_val);
snprintf(comp_buf, sizeof(comp_buf), "%ld", comp_val);
if (base)
snprintf(base_buf, sizeof(base_buf), "%ld", base_val);
else
snprintf(base_buf, sizeof(base_buf), "%s", "N/A");
if (comp)
snprintf(comp_buf, sizeof(comp_buf), "%ld", comp_val);
else
snprintf(comp_buf, sizeof(comp_buf), "%s", "N/A");
diff_val = comp_val - base_val;
if (base == &fallback_stats || comp == &fallback_stats || base_val == 0) {
if (comp_val == base_val)
p = 0.0; /* avoid +0 (+100%) case */
else
p = comp_val < base_val ? -100.0 : 100.0;
if (!base || !comp) {
snprintf(diff_buf, sizeof(diff_buf), "%s", "N/A");
} else {
p = diff_val * 100.0 / base_val;
if (base_val == 0) {
if (comp_val == base_val)
p = 0.0; /* avoid +0 (+100%) case */
else
p = comp_val < base_val ? -100.0 : 100.0;
} else {
p = diff_val * 100.0 / base_val;
}
snprintf(diff_buf, sizeof(diff_buf), "%+ld (%+.2lf%%)", diff_val, p);
}
snprintf(diff_buf, sizeof(diff_buf), "%+ld (%+.2lf%%)", diff_val, p);
}
switch (fmt) {
@ -1328,6 +1366,7 @@ static int cmp_stats_key(const struct verif_stats *base, const struct verif_stat
static int handle_comparison_mode(void)
{
struct stat_specs base_specs = {}, comp_specs = {};
struct stat_specs tmp_sort_spec;
enum resfmt cur_fmt;
int err, i, j;
@ -1370,31 +1409,26 @@ static int handle_comparison_mode(void)
}
}
/* Replace user-specified sorting spec with file+prog sorting rule to
* be able to join two datasets correctly. Once we are done, we will
* restore the original sort spec.
*/
tmp_sort_spec = env.sort_spec;
env.sort_spec = join_sort_spec;
qsort(env.prog_stats, env.prog_stat_cnt, sizeof(*env.prog_stats), cmp_prog_stats);
qsort(env.baseline_stats, env.baseline_stat_cnt, sizeof(*env.baseline_stats), cmp_prog_stats);
env.sort_spec = tmp_sort_spec;
/* for human-readable table output we need to do extra pass to
* calculate column widths, so we substitute current output format
* with RESFMT_TABLE_CALCLEN and later revert it back to RESFMT_TABLE
* and do everything again.
*/
if (env.out_fmt == RESFMT_TABLE)
cur_fmt = RESFMT_TABLE_CALCLEN;
else
cur_fmt = env.out_fmt;
one_more_time:
output_comp_headers(cur_fmt);
/* If baseline and comparison datasets have different subset of rows
* (we match by 'object + prog' as a unique key) then assume
* empty/missing/zero value for rows that are missing in the opposite
* data set
/* Join two datasets together. If baseline and comparison datasets
* have different subset of rows (we match by 'object + prog' as
* a unique key) then assume empty/missing/zero value for rows that
* are missing in the opposite data set.
*/
i = j = 0;
while (i < env.baseline_stat_cnt || j < env.prog_stat_cnt) {
bool last = (i == env.baseline_stat_cnt - 1) || (j == env.prog_stat_cnt - 1);
const struct verif_stats *base, *comp;
struct verif_stats_join *join;
void *tmp;
int r;
base = i < env.baseline_stat_cnt ? &env.baseline_stats[i] : &fallback_stats;
@ -1411,18 +1445,56 @@ static int handle_comparison_mode(void)
return -EINVAL;
}
tmp = realloc(env.join_stats, (env.join_stat_cnt + 1) * sizeof(*env.join_stats));
if (!tmp)
return -ENOMEM;
env.join_stats = tmp;
join = &env.join_stats[env.join_stat_cnt];
memset(join, 0, sizeof(*join));
r = cmp_stats_key(base, comp);
if (r == 0) {
output_comp_stats(base, comp, cur_fmt, last);
join->file_name = base->file_name;
join->prog_name = base->prog_name;
join->stats_a = base;
join->stats_b = comp;
i++;
j++;
} else if (comp == &fallback_stats || r < 0) {
output_comp_stats(base, &fallback_stats, cur_fmt, last);
join->file_name = base->file_name;
join->prog_name = base->prog_name;
join->stats_a = base;
join->stats_b = NULL;
i++;
} else {
output_comp_stats(&fallback_stats, comp, cur_fmt, last);
join->file_name = comp->file_name;
join->prog_name = comp->prog_name;
join->stats_a = NULL;
join->stats_b = comp;
j++;
}
env.join_stat_cnt += 1;
}
/* for human-readable table output we need to do extra pass to
* calculate column widths, so we substitute current output format
* with RESFMT_TABLE_CALCLEN and later revert it back to RESFMT_TABLE
* and do everything again.
*/
if (env.out_fmt == RESFMT_TABLE)
cur_fmt = RESFMT_TABLE_CALCLEN;
else
cur_fmt = env.out_fmt;
one_more_time:
output_comp_headers(cur_fmt);
for (i = 0; i < env.join_stat_cnt; i++) {
const struct verif_stats_join *join = &env.join_stats[i];
bool last = i == env.join_stat_cnt - 1;
output_comp_stats(join, cur_fmt, last);
}
if (cur_fmt == RESFMT_TABLE_CALCLEN) {
@ -1594,6 +1666,7 @@ int main(int argc, char **argv)
free_verif_stats(env.prog_stats, env.prog_stat_cnt);
free_verif_stats(env.baseline_stats, env.baseline_stat_cnt);
free(env.join_stats);
for (i = 0; i < env.filename_cnt; i++)
free(env.filenames[i]);
free(env.filenames);