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sysprofd: add proxy support for mmap2/build_id

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We will want to be able to open perf event streams with these options so
that we can get the build-id extracted from an ELF without having to rely
on parsing it at resolution time.

Additionally, it could give us an option for live-decoding at some point
in userspace without having to write the major DWARF capture data to disk.
This commit is contained in:
Christian Hergert
2023-07-24 15:30:16 -07:00
parent 0fe69dcc68
commit 29772e7ac2
2 changed files with 28 additions and 8 deletions
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4
src/libsysprof/sysprof-perf-event-stream.c
View File

@ -122,6 +122,8 @@ build_options_dict (const struct perf_event_attr *attr)
"{'disabled', <%b>},"
"{'exclude_idle', <%b>},"
"{'mmap', <%b>},"
"{'mmap2', <%b>},"
"{'build_id', <%b>},"
"{'wakeup_events', <%u>},"
"{'sample_id_all', <%b>},"
"{'sample_period', <%t>},"
@ -138,6 +140,8 @@ build_options_dict (const struct perf_event_attr *attr)
(gboolean)!!attr->disabled,
(gboolean)!!attr->exclude_idle,
(gboolean)!!attr->mmap,
(gboolean)!!attr->mmap2,
(gboolean)!!attr->build_id,
(guint32)attr->wakeup_events,
(gboolean)!!attr->sample_id_all,
(guint64)attr->sample_period,

32
src/sysprofd/helpers.c
View File

@ -120,20 +120,22 @@ helpers_perf_event_open (GVariant *options,
struct perf_event_attr attr = {0};
GVariantIter iter;
GVariant *value;
gchar *key;
char *key;
gint32 disabled = 0;
gint32 wakeup_events = 149;
gint32 type = 0;
guint64 sample_period = 0;
guint64 sample_type = 0;
guint64 config = 0;
gint clockid = CLOCK_MONOTONIC;
gint comm = 0;
gint mmap_ = 0;
gint task = 0;
gint exclude_idle = 0;
gint use_clockid = 0;
gint sample_id_all = 0;
int clockid = CLOCK_MONOTONIC;
int comm = 0;
int mmap_ = 0;
int mmap2 = 0;
int build_id = 0;
int task = 0;
int exclude_idle = 0;
int use_clockid = 0;
int sample_id_all = 0;
g_assert (out_fd != NULL);
@ -162,6 +164,12 @@ helpers_perf_event_open (GVariant *options,
goto bad_arg;
sample_id_all = g_variant_get_boolean (value);
}
else if (strcmp (key, "build_id") == 0)
{
if (!g_variant_is_of_type (value, G_VARIANT_TYPE_BOOLEAN))
goto bad_arg;
build_id = g_variant_get_boolean (value);
}
else if (strcmp (key, "clockid") == 0)
{
if (!g_variant_is_of_type (value, G_VARIANT_TYPE_INT32))
@ -186,6 +194,12 @@ helpers_perf_event_open (GVariant *options,
goto bad_arg;
mmap_ = g_variant_get_boolean (value);
}
else if (strcmp (key, "mmap2") == 0)
{
if (!g_variant_is_of_type (value, G_VARIANT_TYPE_BOOLEAN))
goto bad_arg;
mmap2 = g_variant_get_boolean (value);
}
else if (strcmp (key, "config") == 0)
{
if (!g_variant_is_of_type (value, G_VARIANT_TYPE_UINT64))
@ -235,6 +249,8 @@ helpers_perf_event_open (GVariant *options,
attr.disabled = disabled;
attr.exclude_idle = !!exclude_idle;
attr.mmap = !!mmap_;
attr.mmap2 = !!mmap2;
attr.build_id = !!build_id;
attr.sample_id_all = sample_id_all;
attr.sample_period = sample_period;
attr.sample_type = sample_type;