From: John Ogness <john.ogness@linutronix.de> To: Petr Mladek <pmladek@suse.com> Cc: Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>, Sergey Senozhatsky <sergey.senozhatsky@gmail.com>, Steven Rostedt <rostedt@goodmis.org>, Linus Torvalds <torvalds@linux-foundation.org>, Greg Kroah-Hartman <gregkh@linuxfoundation.org>, Thomas Gleixner <tglx@linutronix.de>, Peter Zijlstra <peterz@infradead.org>, Andrea Parri <parri.andrea@gmail.com>, Paul McKenney <paulmck@kernel.org>, kexec@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH next v3 8/8] scripts/gdb: support printk finalized records Date: Mon, 31 Aug 2020 03:16:58 +0206 [thread overview] Message-ID: <20200831011058.6286-9-john.ogness@linutronix.de> (raw) In-Reply-To: <20200831011058.6286-1-john.ogness@linutronix.de> With commit ("printk: ringbuffer: add finalization/extension support") a new state bit for finalized records was added. This not only changed the bit representation of committed records, but also reduced the size for record IDs. Update the gdb scripts to correctly interpret the state variable. Signed-off-by: John Ogness <john.ogness@linutronix.de> --- Documentation/admin-guide/kdump/gdbmacros.txt | 10 +++++++--- scripts/gdb/linux/dmesg.py | 10 ++++++---- 2 files changed, 13 insertions(+), 7 deletions(-) diff --git a/Documentation/admin-guide/kdump/gdbmacros.txt b/Documentation/admin-guide/kdump/gdbmacros.txt index 7adece30237e..bcb78368b381 100644 --- a/Documentation/admin-guide/kdump/gdbmacros.txt +++ b/Documentation/admin-guide/kdump/gdbmacros.txt @@ -295,8 +295,11 @@ document dump_record end define dmesg - set var $desc_committed = 1UL << ((sizeof(long) * 8) - 1) - set var $flags_mask = 3UL << ((sizeof(long) * 8) - 2) + # definitions from kernel/printk/printk_ringbuffer.h + set var $desc_commit = 1UL << ((sizeof(long) * 8) - 1) + set var $desc_final = 1UL << ((sizeof(long) * 8) - 2) + set var $desc_reuse = 1UL << ((sizeof(long) * 8) - 3) + set var $flags_mask = $desc_commit | $desc_final | $desc_reuse set var $id_mask = ~$flags_mask set var $desc_count = 1U << prb->desc_ring.count_bits @@ -309,7 +312,8 @@ define dmesg set var $desc = &prb->desc_ring.descs[$id % $desc_count] # skip non-committed record - if (($desc->state_var.counter & $flags_mask) == $desc_committed) + # (note that commit+!final records will be displayed) + if (($desc->state_var.counter & $desc_commit) == $desc_commit) dump_record $desc $prev_flags set var $prev_flags = $desc->info.flags end diff --git a/scripts/gdb/linux/dmesg.py b/scripts/gdb/linux/dmesg.py index 6c6022012ea8..367523c5c270 100644 --- a/scripts/gdb/linux/dmesg.py +++ b/scripts/gdb/linux/dmesg.py @@ -79,9 +79,10 @@ class LxDmesg(gdb.Command): # definitions from kernel/printk/printk_ringbuffer.h desc_sv_bits = utils.get_long_type().sizeof * 8 - desc_committed_mask = 1 << (desc_sv_bits - 1) - desc_reuse_mask = 1 << (desc_sv_bits - 2) - desc_flags_mask = desc_committed_mask | desc_reuse_mask + desc_commit_mask = 1 << (desc_sv_bits - 1) + desc_final_mask = 1 << (desc_sv_bits - 2) + desc_reuse_mask = 1 << (desc_sv_bits - 3) + desc_flags_mask = desc_commit_mask | desc_final_mask | desc_reuse_mask desc_id_mask = ~desc_flags_mask # read in tail and head descriptor ids @@ -96,8 +97,9 @@ class LxDmesg(gdb.Command): desc_off = desc_sz * ind # skip non-committed record + # (note that commit+!final records will be displayed) state = utils.read_u64(descs, desc_off + sv_off + counter_off) & desc_flags_mask - if state != desc_committed_mask: + if state & desc_commit_mask != desc_commit_mask: if did == head_id: break did = (did + 1) & desc_id_mask -- 2.20.1
WARNING: multiple messages have this Message-ID (diff)
From: John Ogness <john.ogness@linutronix.de> To: Petr Mladek <pmladek@suse.com> Cc: Andrea Parri <parri.andrea@gmail.com>, Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>, Paul McKenney <paulmck@kernel.org>, Peter Zijlstra <peterz@infradead.org>, Greg Kroah-Hartman <gregkh@linuxfoundation.org>, kexec@lists.infradead.org, linux-kernel@vger.kernel.org, Steven Rostedt <rostedt@goodmis.org>, Sergey Senozhatsky <sergey.senozhatsky@gmail.com>, Thomas Gleixner <tglx@linutronix.de>, Linus Torvalds <torvalds@linux-foundation.org> Subject: [PATCH next v3 8/8] scripts/gdb: support printk finalized records Date: Mon, 31 Aug 2020 03:16:58 +0206 [thread overview] Message-ID: <20200831011058.6286-9-john.ogness@linutronix.de> (raw) In-Reply-To: <20200831011058.6286-1-john.ogness@linutronix.de> With commit ("printk: ringbuffer: add finalization/extension support") a new state bit for finalized records was added. This not only changed the bit representation of committed records, but also reduced the size for record IDs. Update the gdb scripts to correctly interpret the state variable. Signed-off-by: John Ogness <john.ogness@linutronix.de> --- Documentation/admin-guide/kdump/gdbmacros.txt | 10 +++++++--- scripts/gdb/linux/dmesg.py | 10 ++++++---- 2 files changed, 13 insertions(+), 7 deletions(-) diff --git a/Documentation/admin-guide/kdump/gdbmacros.txt b/Documentation/admin-guide/kdump/gdbmacros.txt index 7adece30237e..bcb78368b381 100644 --- a/Documentation/admin-guide/kdump/gdbmacros.txt +++ b/Documentation/admin-guide/kdump/gdbmacros.txt @@ -295,8 +295,11 @@ document dump_record end define dmesg - set var $desc_committed = 1UL << ((sizeof(long) * 8) - 1) - set var $flags_mask = 3UL << ((sizeof(long) * 8) - 2) + # definitions from kernel/printk/printk_ringbuffer.h + set var $desc_commit = 1UL << ((sizeof(long) * 8) - 1) + set var $desc_final = 1UL << ((sizeof(long) * 8) - 2) + set var $desc_reuse = 1UL << ((sizeof(long) * 8) - 3) + set var $flags_mask = $desc_commit | $desc_final | $desc_reuse set var $id_mask = ~$flags_mask set var $desc_count = 1U << prb->desc_ring.count_bits @@ -309,7 +312,8 @@ define dmesg set var $desc = &prb->desc_ring.descs[$id % $desc_count] # skip non-committed record - if (($desc->state_var.counter & $flags_mask) == $desc_committed) + # (note that commit+!final records will be displayed) + if (($desc->state_var.counter & $desc_commit) == $desc_commit) dump_record $desc $prev_flags set var $prev_flags = $desc->info.flags end diff --git a/scripts/gdb/linux/dmesg.py b/scripts/gdb/linux/dmesg.py index 6c6022012ea8..367523c5c270 100644 --- a/scripts/gdb/linux/dmesg.py +++ b/scripts/gdb/linux/dmesg.py @@ -79,9 +79,10 @@ class LxDmesg(gdb.Command): # definitions from kernel/printk/printk_ringbuffer.h desc_sv_bits = utils.get_long_type().sizeof * 8 - desc_committed_mask = 1 << (desc_sv_bits - 1) - desc_reuse_mask = 1 << (desc_sv_bits - 2) - desc_flags_mask = desc_committed_mask | desc_reuse_mask + desc_commit_mask = 1 << (desc_sv_bits - 1) + desc_final_mask = 1 << (desc_sv_bits - 2) + desc_reuse_mask = 1 << (desc_sv_bits - 3) + desc_flags_mask = desc_commit_mask | desc_final_mask | desc_reuse_mask desc_id_mask = ~desc_flags_mask # read in tail and head descriptor ids @@ -96,8 +97,9 @@ class LxDmesg(gdb.Command): desc_off = desc_sz * ind # skip non-committed record + # (note that commit+!final records will be displayed) state = utils.read_u64(descs, desc_off + sv_off + counter_off) & desc_flags_mask - if state != desc_committed_mask: + if state & desc_commit_mask != desc_commit_mask: if did == head_id: break did = (did + 1) & desc_id_mask -- 2.20.1 _______________________________________________ kexec mailing list kexec@lists.infradead.org http://lists.infradead.org/mailman/listinfo/kexec
next prev parent reply other threads:[~2020-08-31 1:11 UTC|newest] Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top 2020-08-31 1:10 [PATCH next v3 0/8] printk: reimplement LOG_CONT handling John Ogness 2020-08-31 1:10 ` John Ogness 2020-08-31 1:10 ` [PATCH next v3 1/8] printk: ringbuffer: rename DESC_COMMITTED_MASK flag John Ogness 2020-08-31 1:10 ` John Ogness 2020-08-31 1:10 ` [PATCH next v3 2/8] printk: ringbuffer: change representation of reusable John Ogness 2020-08-31 1:10 ` John Ogness 2020-08-31 1:10 ` [PATCH next v3 3/8] printk: ringbuffer: relocate get_data() John Ogness 2020-08-31 1:10 ` John Ogness 2020-08-31 1:10 ` [PATCH next v3 4/8] printk: ringbuffer: add BLK_DATALESS() macro John Ogness 2020-08-31 1:10 ` John Ogness 2020-08-31 1:10 ` [PATCH next v3 5/8] printk: ringbuffer: clear initial reserved fields John Ogness 2020-08-31 1:10 ` John Ogness 2020-09-01 14:33 ` Petr Mladek 2020-09-01 14:33 ` Petr Mladek 2020-08-31 1:10 ` [PATCH next v3 6/8] printk: ringbuffer: add finalization/extension support John Ogness 2020-08-31 1:10 ` John Ogness 2020-08-31 12:54 ` John Ogness 2020-08-31 12:54 ` John Ogness 2020-09-02 10:52 ` state names: vas: " Petr Mladek 2020-09-02 10:52 ` Petr Mladek 2020-09-02 11:20 ` John Ogness 2020-09-02 11:20 ` John Ogness 2020-09-02 12:39 ` Petr Mladek 2020-09-02 12:39 ` Petr Mladek 2020-09-02 10:58 ` Petr Mladek 2020-09-02 10:58 ` Petr Mladek 2020-09-02 12:21 ` misc: was: " Petr Mladek 2020-09-02 12:21 ` Petr Mladek 2020-08-31 1:10 ` [PATCH next v3 7/8] printk: reimplement log_cont using record extension John Ogness 2020-08-31 1:10 ` John Ogness 2020-09-02 13:38 ` Petr Mladek 2020-09-02 13:38 ` Petr Mladek 2020-08-31 1:10 ` John Ogness [this message] 2020-08-31 1:10 ` [PATCH next v3 8/8] scripts/gdb: support printk finalized records John Ogness
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