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author | Jan Kiszka <jan.kiszka@siemens.com> | 2015-02-17 13:47:27 -0800 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2015-02-17 14:34:54 -0800 |
commit | 3d4cd9c94191f60cbb741cfbaa770d442c4680aa (patch) | |
tree | 53da922f74f37c17804a4b26da909797d8bc45e3 /scripts/gdb/linux | |
parent | 116b47b4da037547585cebe4e3275ef68905d509 (diff) | |
download | linux-stable-3d4cd9c94191f60cbb741cfbaa770d442c4680aa.tar.gz linux-stable-3d4cd9c94191f60cbb741cfbaa770d442c4680aa.tar.bz2 linux-stable-3d4cd9c94191f60cbb741cfbaa770d442c4680aa.zip |
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 <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: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'scripts/gdb/linux')
-rw-r--r-- | scripts/gdb/linux/cpus.py | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/scripts/gdb/linux/cpus.py b/scripts/gdb/linux/cpus.py index b683da92f194..c1441f23c0c2 100644 --- a/scripts/gdb/linux/cpus.py +++ b/scripts/gdb/linux/cpus.py @@ -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. |