The patch titled Subject: scripts/gdb: add internal helper and convenience function for per-cpu lookup has been added to the -mm tree. Its filename is scripts-gdb-add-internal-helper-and-convenience-function-for-per-cpu-lookup.patch This patch should soon appear at http://ozlabs.org/~akpm/mmots/broken-out/scripts-gdb-add-internal-helper-and-convenience-function-for-per-cpu-lookup.patch and later at http://ozlabs.org/~akpm/mmotm/broken-out/scripts-gdb-add-internal-helper-and-convenience-function-for-per-cpu-lookup.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 internal helper and convenience function for per-cpu lookup This function allows to obtain a per-cpu variable, either of the current or an explicitly specified CPU. Note: sparc64 version is untested. Signed-off-by: Jan Kiszka <jan.kiszka@xxxxxxxxxxx> Cc: "David S. Miller" <davem@xxxxxxxxxxxxx> 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 | 68 +++++++++++++++++++++++++++++++++++ scripts/gdb/vmlinux-gdb.py | 1 2 files changed, 69 insertions(+) diff -puN /dev/null scripts/gdb/linux/cpus.py --- /dev/null +++ a/scripts/gdb/linux/cpus.py @@ -0,0 +1,68 @@ +# +# gdb helper commands and functions for Linux kernel debugging +# +# per-cpu tools +# +# Copyright (c) Siemens AG, 2011-2013 +# +# Authors: +# Jan Kiszka <jan.kiszka@xxxxxxxxxxx> +# +# This work is licensed under the terms of the GNU GPL version 2. +# + +import gdb + +from linux import tasks, utils + + +MAX_CPUS = 4096 + + +def get_current_cpu(): + if utils.get_gdbserver_type() == utils.GDBSERVER_QEMU: + return gdb.selected_thread().num - 1 + elif utils.get_gdbserver_type() == utils.GDBSERVER_KGDB: + tid = gdb.selected_thread().ptid[2] + if tid > (0x100000000 - MAX_CPUS - 2): + return 0x100000000 - tid - 2 + else: + return tasks.get_thread_info(tasks.get_task_by_pid(tid))['cpu'] + else: + raise gdb.GdbError("Sorry, obtaining the current CPU is not yet " + "supported with this gdb server.") + + +def per_cpu(var_ptr, cpu): + if cpu == -1: + cpu = get_current_cpu() + if utils.is_target_arch("sparc:v9"): + offset = gdb.parse_and_eval( + "trap_block[{0}].__per_cpu_base".format(str(cpu))) + else: + try: + offset = gdb.parse_and_eval( + "__per_cpu_offset[{0}]".format(str(cpu))) + except gdb.error: + # !CONFIG_SMP case + offset = 0 + pointer = var_ptr.cast(utils.get_long_type()) + offset + return pointer.cast(var_ptr.type).dereference() + + +class PerCpu(gdb.Function): + """Return per-cpu variable. + +$lx_per_cpu("VAR"[, CPU]): Return the per-cpu variable called VAR for the +given CPU number. If CPU is omitted, the CPU of the current context is used. +Note that VAR has to be quoted as string.""" + + def __init__(self): + super(PerCpu, self).__init__("lx_per_cpu") + + def invoke(self, var_name, cpu=-1): + var_ptr = gdb.parse_and_eval("&" + var_name.string()) + return per_cpu(var_ptr, cpu) + + +PerCpu() diff -puN scripts/gdb/vmlinux-gdb.py~scripts-gdb-add-internal-helper-and-convenience-function-for-per-cpu-lookup scripts/gdb/vmlinux-gdb.py --- a/scripts/gdb/vmlinux-gdb.py~scripts-gdb-add-internal-helper-and-convenience-function-for-per-cpu-lookup +++ a/scripts/gdb/vmlinux-gdb.py @@ -27,3 +27,4 @@ else: import linux.modules import linux.dmesg import linux.tasks + import linux.cpus _ 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