Will be used first to count module references. It is optimized to read
the mask only once per stop and to minimize the loop lengths.
Signed-off-by: Jan Kiszka <jan.kis...@siemens.com>
---
scripts/gdb/percpu.py | 33 +++++++++++++++++++++++++++++++++
1 files changed, 33 insertions(+), 0 deletions(-)
diff --git a/scripts/gdb/percpu.py b/scripts/gdb/percpu.py
index 4dab8d3..bc04188 100644
--- a/scripts/gdb/percpu.py
+++ b/scripts/gdb/percpu.py
@@ -43,6 +43,39 @@ def per_cpu(var_ptr, cpu):
pointer = var_ptr.cast(get_long_type()) + offset
return pointer.cast(var_ptr.type).dereference()
+cpu_mask = { }
+
+def for_each_cpu(mask_name, func, arg = None):
+ def invalidate_handler(event):
+ global cpu_online_mask
+ cpu_mask = { }
+ gdb.events.stop.disconnect(invalidate_handler)
+ gdb.events.new_objfile.disconnect(invalidate_handler)
+
+ global cpu_mask
+ mask = None
+ if mask_name in cpu_mask:
+ mask = cpu_mask[mask_name]
+ if mask == None:
+ mask = gdb.parse_and_eval(mask_name + ".bits")
+ cpu_mask[mask_name] = mask
+ gdb.events.stop.connect(invalidate_handler)
+ gdb.events.new_objfile.connect(invalidate_handler)
+
+ max_cpu_id = mask.type.sizeof * 8
+ bits_per_entry = mask[0].type.sizeof * 8
+ for entry in range(max_cpu_id / bits_per_entry):
+ bits = mask[entry]
+ if bits == 0:
+ continue
+ for bit in range(bits_per_entry):
+ if bits & 1:
+ cpu = entry * bits_per_entry + bit
+ func(cpu, arg)
+ bits >>= 1
+ if bits == 0:
+ break
+
class PerCpu(gdb.Function):
__doc__ = "Return per-cpu variable.\n" \
--
1.7.3.4
--
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