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properties: Skip found set building for nominal case

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bus_message_print_all_properties() inserts every name it walks into the
found-properties set, but the set is only used to report missing requested
properties at debug level.

Request the set from systemctl only when properties were specified and debug
logging is enabled, avoiding the unnecessary work in normal operation.

In my tests with `systemctl show` over 160 units this brings the
instructions retired from 1167.8M down to 992.6M, a reduction of 15.0%.
The output is unchanged.
This commit is contained in:
Chris Down
2026-07-31 16:41:53 -07:00
parent c844a88f69
commit 5663ddaed7
1 changed files with 10 additions and 4 deletions
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src/systemctl/systemctl-show.c
+10 -4
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@@ -2336,6 +2336,7 @@ static int show_one(
.io_read_bytes = UINT64_MAX,
.io_write_bytes = UINT64_MAX,
};
bool collect_found_properties;
int r;
assert(path);
@@ -2387,13 +2388,18 @@ static int show_one(
if (r < 0)
return log_error_errno(r, "Failed to rewind: %s", bus_error_message(&error, r));
r = bus_message_print_all_properties(reply, print_property, arg_properties, arg_print_flags, &found_properties);
/* The found properties set is expensive and only used for debug logging, so collect it only when needed. */
collect_found_properties = DEBUG_LOGGING && !strv_isempty(arg_properties);
r = bus_message_print_all_properties(reply, print_property, arg_properties, arg_print_flags,
collect_found_properties ? &found_properties : NULL);
if (r < 0)
return bus_log_parse_error(r);
STRV_FOREACH(pp, arg_properties)
if (!set_contains(found_properties, *pp))
log_debug("Property %s does not exist.", *pp);
if (collect_found_properties)
STRV_FOREACH(pp, arg_properties)
if (!set_contains(found_properties, *pp))
log_debug("Property %s does not exist.", *pp);
return 0;
}