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plugins/howvec: adapting to the new argument passing scheme 

Correctly parsing plugin argument since they now must be provided as
full-form boolean parameters, e.g.:
    -plugin ./contrib/plugins/libhowvec.so,verbose=on,inline=on

Also, introduced the argument "count" that accepts one opt to count
individually at a time.

Signed-off-by: Mahmoud Mandour <ma.mandourr@gmail.com>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Tested-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20210730135817.17816-8-ma.mandourr@gmail.com>
This commit is contained in:
Mahmoud Mandour 2021-07-30 15:58:11 +02:00 committed by Alex Bennée
parent 60753843f6
commit d852535859
2 changed files with 24 additions and 13 deletions
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27
contrib/plugins/howvec.c
View File

@ -333,23 +333,34 @@ QEMU_PLUGIN_EXPORT int qemu_plugin_install(qemu_plugin_id_t id,
for (i = 0; i < argc; i++) {
char *p = argv[i];
if (strcmp(p, "inline") == 0) {
do_inline = true;
} else if (strcmp(p, "verbose") == 0) {
verbose = true;
} else {
g_autofree char **tokens = g_strsplit(p, "=", -1);
if (g_strcmp0(tokens[0], "inline") == 0) {
if (!qemu_plugin_bool_parse(tokens[0], tokens[1], &do_inline)) {
fprintf(stderr, "boolean argument parsing failed: %s\n", p);
return -1;
}
} else if (g_strcmp0(tokens[0], "verbose") == 0) {
if (!qemu_plugin_bool_parse(tokens[0], tokens[1], &verbose)) {
fprintf(stderr, "boolean argument parsing failed: %s\n", p);
return -1;
}
} else if (g_strcmp0(tokens[0], "count") == 0) {
char *value = tokens[1];
int j;
CountType type = COUNT_INDIVIDUAL;
if (*p == '!') {
if (*value == '!') {
type = COUNT_NONE;
p++;
value++;
}
for (j = 0; j < class_table_sz; j++) {
if (strcmp(p, class_table[j].opt) == 0) {
if (strcmp(value, class_table[j].opt) == 0) {
class_table[j].what = type;
break;
}
}
} else {
fprintf(stderr, "option parsing failed: %s\n", p);
return -1;
}
}

10
docs/devel/tcg-plugins.rst
View File

@ -80,7 +80,7 @@ Once built a program can be run with multiple plugins loaded each with
their own arguments::
$QEMU $OTHER_QEMU_ARGS \
-plugin tests/plugin/libhowvec.so,arg=inline,arg=hint \
-plugin tests/plugin/libhowvec.so,inline=on,count=hint \
-plugin tests/plugin/libhotblocks.so
Arguments are plugin specific and can be used to modify their
@ -212,13 +212,13 @@ The hotpages plugin can be configured using the following arguments:
This is an instruction classifier so can be used to count different
types of instructions. It has a number of options to refine which get
counted. You can give an argument for a class of instructions to break
it down fully, so for example to see all the system registers
accesses::
counted. You can give a value to the `count` argument for a class of
instructions to break it down fully, so for example to see all the system
registers accesses::
./aarch64-softmmu/qemu-system-aarch64 $(QEMU_ARGS) \
-append "root=/dev/sda2 systemd.unit=benchmark.service" \
-smp 4 -plugin ./contrib/plugins/libhowvec.so,arg=sreg -d plugin
-smp 4 -plugin ./contrib/plugins/libhowvec.so,count=sreg -d plugin
which will lead to a sorted list after the class breakdown::