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libsysprof: add support for stack/regs options in attr

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This requires a coordinating sysprofd that knows how to handle reading the
new attributes. Setting these fields will allow snapshotting the contents
of the stack and registers to do offline unwinding.

Also make the conversion to GVariant available outside the module so that
we can consume it for live unwinding.
This commit is contained in:
Christian Hergert
2024-11-03 10:39:23 -08:00
parent fde9f5868c
commit 39b96f47f5
3 changed files with 36 additions and 15 deletions
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16
src/sysprofd/helpers.c
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@ -127,6 +127,8 @@ helpers_perf_event_open (GVariant *options,
guint64 sample_period = 0;
guint64 sample_type = 0;
guint64 config = 0;
guint64 sample_regs_user = 0;
guint sample_stack_user = 0;
int clockid = CLOCK_MONOTONIC;
int comm = 0;
int mmap_ = 0;
@ -236,6 +238,18 @@ helpers_perf_event_open (GVariant *options,
goto bad_arg;
use_clockid = g_variant_get_boolean (value);
}
else if (strcmp (key, "sample_stack_user") == 0)
{
if (!g_variant_is_of_type (value, G_VARIANT_TYPE_UINT32))
goto bad_arg;
sample_stack_user = g_variant_get_uint32 (value);
}
else if (strcmp (key, "sample_regs_user") == 0)
{
if (!g_variant_is_of_type (value, G_VARIANT_TYPE_UINT64))
goto bad_arg;
sample_regs_user = g_variant_get_uint64 (value);
}
continue;
@ -257,6 +271,8 @@ helpers_perf_event_open (GVariant *options,
attr.task = !!task;
attr.type = type;
attr.wakeup_events = wakeup_events;
attr.sample_regs_user = sample_regs_user;
attr.sample_stack_user = sample_stack_user;
#ifdef HAVE_PERF_CLOCKID
if (!use_clockid || clockid < 0)