The patch titled Subject: scripts/gdb: add class to iterate over CPU masks has been added to the -mm tree. Its filename is scripts-gdb-add-class-to-iterate-over-cpu-masks.patch This patch should soon appear at http://ozlabs.org/~akpm/mmots/broken-out/scripts-gdb-add-class-to-iterate-over-cpu-masks.patch and later at http://ozlabs.org/~akpm/mmotm/broken-out/scripts-gdb-add-class-to-iterate-over-cpu-masks.patch Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/SubmitChecklist when testing your code *** The -mm tree is included into linux-next and is updated there every 3-4 working days ------------------------------------------------------ From: Jan Kiszka <jan.kiszka@xxxxxxxxxxx> Subject: 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@xxxxxxxxxxx> Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx> Cc: Jason Wessel <jason.wessel@xxxxxxxxxxxxx> Cc: Andi Kleen <andi@xxxxxxxxxxxxxx> Cc: Ben Widawsky <ben@xxxxxxxxxxxx> Cc: Borislav Petkov <bp@xxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- scripts/gdb/linux/cpus.py | 54 ++++++++++++++++++++++++++++++++++++ 1 file changed, 54 insertions(+) diff -puN scripts/gdb/linux/cpus.py~scripts-gdb-add-class-to-iterate-over-cpu-masks scripts/gdb/linux/cpus.py --- a/scripts/gdb/linux/cpus.py~scripts-gdb-add-class-to-iterate-over-cpu-masks +++ a/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. _ Patches currently in -mm which might be from jan.kiszka@xxxxxxxxxxx are scripts-gdb-add-infrastructure.patch scripts-gdb-add-cache-for-type-objects.patch scripts-gdb-add-container_of-helper-and-convenience-function.patch scripts-gdb-add-module-iteration-class.patch scripts-gdb-add-lx-symbols-command.patch module-do-not-inline-do_init_module.patch scripts-gdb-add-automatic-symbol-reloading-on-module-insertion.patch scripts-gdb-add-internal-helper-and-convenience-function-to-look-up-a-module.patch scripts-gdb-add-get_target_endianness-helper.patch scripts-gdb-add-read_u16-32-64-helpers.patch scripts-gdb-add-lx-dmesg-command.patch scripts-gdb-add-task-iteration-class.patch scripts-gdb-add-helper-and-convenience-function-to-look-up-tasks.patch scripts-gdb-add-is_target_arch-helper.patch scripts-gdb-add-internal-helper-and-convenience-function-to-retrieve-thread_info.patch scripts-gdb-add-get_gdbserver_type-helper.patch scripts-gdb-add-internal-helper-and-convenience-function-for-per-cpu-lookup.patch scripts-gdb-add-lx_current-convenience-function.patch scripts-gdb-add-class-to-iterate-over-cpu-masks.patch scripts-gdb-add-lx-lsmod-command.patch scripts-gdb-add-basic-documentation.patch scripts-gdb-port-to-python3-gdb77.patch scripts-gdb-ignore-byte-compiled-python-files.patch scripts-gdb-use-a-generator-instead-of-iterator-for-task-list.patch scripts-gdb-convert-modulelist-to-generator-function.patch scripts-gdb-convert-cpulist-to-generator-function.patch scripts-gdb-define-maintainer.patch scripts-gdb-disable-pagination-while-printing-from-breakpoint-handler.patch -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html