Commit 3d4cd9c9 authored by Jan Kiszka's avatar Jan Kiszka Committed by Linus Torvalds

scripts/gdb: add class to iterate over CPU masks

Will be used first to count module references.  It is optimized to read
the mask only once per stop.
Signed-off-by: Jan Kiszka's avatarJan Kiszka <jan.kiszka@siemens.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Jason Wessel <jason.wessel@windriver.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Ben Widawsky <ben@bwidawsk.net>
Cc: Borislav Petkov <bp@suse.de>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 116b47b4
......@@ -50,6 +50,60 @@ def per_cpu(var_ptr, cpu):
return pointer.cast(var_ptr.type).dereference()
cpu_mask = {}
def cpu_mask_invalidate(event):
global cpu_mask
cpu_mask = {}
gdb.events.stop.disconnect(cpu_mask_invalidate)
if hasattr(gdb.events, 'new_objfile'):
gdb.events.new_objfile.disconnect(cpu_mask_invalidate)
class CpuList():
def __init__(self, mask_name):
global cpu_mask
self.mask = None
if mask_name in cpu_mask:
self.mask = cpu_mask[mask_name]
if self.mask is None:
self.mask = gdb.parse_and_eval(mask_name + ".bits")
if hasattr(gdb, 'events'):
cpu_mask[mask_name] = self.mask
gdb.events.stop.connect(cpu_mask_invalidate)
if hasattr(gdb.events, 'new_objfile'):
gdb.events.new_objfile.connect(cpu_mask_invalidate)
self.bits_per_entry = self.mask[0].type.sizeof * 8
self.num_entries = self.mask.type.sizeof * 8 / self.bits_per_entry
self.entry = -1
self.bits = 0
def __iter__(self):
return self
def next(self):
while self.bits == 0:
self.entry += 1
if self.entry == self.num_entries:
raise StopIteration
self.bits = self.mask[self.entry]
if self.bits != 0:
self.bit = 0
break
while self.bits & 1 == 0:
self.bits >>= 1
self.bit += 1
cpu = self.entry * self.bits_per_entry + self.bit
self.bits >>= 1
self.bit += 1
return cpu
class PerCpu(gdb.Function):
"""Return per-cpu variable.
......
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