Update PC sampling doc (#798)

[ROCm/rocprofiler-compute commit: 78c1898ba0]

projects/rocprofiler-compute/docs/how-to/pc_sampling.rst

@@ -20,10 +20,10 @@ Profiling options
 ---------------------
 For using profiling options for PC sampling the configuration needed are:
 
-* ``--pc-sampling-method``: Should be either ``stochastic`` or ``host_trap``
+* ``--pc-sampling-method``: Should be either ``stochastic`` or ``host_trap``, (DEFAULT: stochastic)
-* ``--pc-sampling-interval``: For stochastic sampling, the interval is in cycles. The finest granularity is 1 cycle. For host_trap sampling, the interval is in microsecond (DEFAULT: 1048576). The interval should be the power of 2. You are recommended to try to starting from 1048576, and lowering until reaching 65536.
+* ``--pc-sampling-interval``: For stochastic sampling, the interval is in cycles. The finest granularity is 1 cycle. For ``host_trap`` sampling, the interval is in microsecond (DEFAULT: 1048576). The interval should be the power of 2. You are recommended try starting from 1048576, and lowering until reaching 65536.
 
-**Sample command:** 
+**Sample command:**
 
 .. code-block:: shell
 
@@ -42,8 +42,33 @@ For using analysis options for PC sampling the configuration needed are:
 
    $ rocprof-compute analyze -p workloads/pc_test/MI300A_A1/ -b 21 -k 0 --pc-sampling-sorting-type offset
 
+**Sample output:**
+
+Selecting single kernel host trap PC sampling:
+
+.. image:: ../data/pc_sampling/pc_sampling_host_trap_single_kernel.png
+   :align: left
+   :alt: Host trap PC sampling snapshot
+
+Selecting single kernel stochastic PC sampling:
+
+.. image:: ../data/pc_sampling/pc_sampling_stochastic_single_kernel.png
+   :align: left
+   :alt: Stochastic PC sampling snapshot
+
+If you don't filter by kernel, the output will fall back to the original data from ``rocprofv3`` csv output for all the kernels:
+
+.. image:: ../data/pc_sampling/pc_sampling_no_kernel_filtering.png
+   :align: left
+   :alt: Host trap PC sampling snapshot no_kernel_filtering
+
+Selecting single kernel sorting by PC count:
+
+.. image:: ../data/pc_sampling/pc_sampling_sort_by_count.png
+   :align: left
+   :alt: Host trap PC sampling sorting snapshot
+
 .. note::
 
   * PC sampling feature is currently in BETA version. To enable PC sampling, you have to explicitly enable it with block index 21.
-  * To associate PC sampling info back to HIP source code, you need to build the profiling target app with ``-g`` to keep the symbols. Otherwise, PC sampling info would be only associated with assembly lines.
+  * To associate PC sampling info back to HIP source code, you need to build the profiling target app with ``-g`` to keep the symbols. Otherwise, PC sampling info will be only associated with assembly lines.
-