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plugins/hwprofile: adapt to the new plugin arguments scheme

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Parsing boolean arguments correctly (e.g. pattern=on or source=false).
Introduced a new "track" argument that takes a [read|write] value. This
substitutes passing read or write to "arg=" that is deprecated.

Also, matches are now taken one by one through the "match" argument.

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: <20210730135817.17816-7-ma.mandourr@gmail.com>
This commit is contained in:
Mahmoud Mandour 2021-07-30 15:58:10 +02:00 committed by Alex Bennée
parent b18a0cad81
commit 60753843f6
2 changed files with 31 additions and 16 deletions
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39
contrib/plugins/hwprofile.c
View File

@ -259,27 +259,42 @@ int qemu_plugin_install(qemu_plugin_id_t id, const qemu_info_t *info,
int argc, char **argv)
{
int i;
g_autoptr(GString) matches_raw = g_string_new("");
for (i = 0; i < argc; i++) {
char *opt = argv[i];
if (g_strcmp0(opt, "read") == 0) {
rw = QEMU_PLUGIN_MEM_R;
} else if (g_strcmp0(opt, "write") == 0) {
rw = QEMU_PLUGIN_MEM_W;
} else if (g_strcmp0(opt, "pattern") == 0) {
pattern = true;
} else if (g_strcmp0(opt, "source") == 0) {
source = true;
} else if (g_str_has_prefix(opt, "match")) {
gchar **parts = g_strsplit(opt, "=", 2);
g_autofree char **tokens = g_strsplit(opt, "=", 2);
if (g_strcmp0(tokens[0], "track") == 0) {
if (g_strcmp0(tokens[1], "read") == 0) {
rw = QEMU_PLUGIN_MEM_R;
} else if (g_strcmp0(tokens[1], "write") == 0) {
rw = QEMU_PLUGIN_MEM_W;
} else {
fprintf(stderr, "invalid value for track: %s\n", tokens[1]);
return -1;
}
} else if (g_strcmp0(tokens[0], "pattern") == 0) {
if (!qemu_plugin_bool_parse(tokens[0], tokens[1], &pattern)) {
fprintf(stderr, "boolean argument parsing failed: %s\n", opt);
return -1;
}
} else if (g_strcmp0(tokens[0], "source") == 0) {
if (!qemu_plugin_bool_parse(tokens[0], tokens[1], &source)) {
fprintf(stderr, "boolean argument parsing failed: %s\n", opt);
return -1;
}
} else if (g_strcmp0(tokens[0], "match") == 0) {
check_match = true;
matches = g_strsplit(parts[1], ",", -1);
g_strfreev(parts);
g_string_append_printf(matches_raw, "%s,", tokens[1]);
} else {
fprintf(stderr, "option parsing failed: %s\n", opt);
return -1;
}
}
if (check_match) {
matches = g_strsplit(matches_raw->str, ",", -1);
}
if (source && pattern) {
fprintf(stderr, "can only currently track either source or pattern.\n");

8
docs/devel/tcg-plugins.rst
View File

@ -306,22 +306,22 @@ which will eventually report::
The hwprofile tool can only be used with system emulation and allows
the user to see what hardware is accessed how often. It has a number of options:
* arg=read or arg=write
* track=read or track=write
By default the plugin tracks both reads and writes. You can use one
of these options to limit the tracking to just one class of accesses.
* arg=source
* source
Will include a detailed break down of what the guest PC that made the
access was. Not compatible with arg=pattern. Example output::
access was. Not compatible with the pattern option. Example output::
cirrus-low-memory @ 0xfffffd00000a0000
pc:fffffc0000005cdc, 1, 256
pc:fffffc0000005ce8, 1, 256
pc:fffffc0000005cec, 1, 256
* arg=pattern
* pattern
Instead break down the accesses based on the offset into the HW
region. This can be useful for seeing the most used registers of a