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| author | John Ogness <john.ogness@linutronix.de> | 2020-09-21 13:24:45 +0206 |
|---|---|---|
| committer | Petr Mladek <pmladek@suse.com> | 2020-09-22 11:27:48 +0200 |
| commit | 74caba7f2a0685575b3ee5330a118f5922485e02 (patch) | |
| tree | eb195b5d665b166c8158af3bcdc151d2b84b447f /scripts | |
| parent | cfe2790b163acdc9c058a63bff310923e84a16b4 (diff) | |
| download | linux-stable-74caba7f2a0685575b3ee5330a118f5922485e02.tar.gz linux-stable-74caba7f2a0685575b3ee5330a118f5922485e02.tar.bz2 linux-stable-74caba7f2a0685575b3ee5330a118f5922485e02.zip | |
printk: move dictionary keys to dev_printk_info
Dictionaries are only used for SUBSYSTEM and DEVICE properties. The
current implementation stores the property names each time they are
used. This requires more space than otherwise necessary. Also,
because the dictionary entries are currently considered optional,
it cannot be relied upon that they are always available, even if the
writer wanted to store them. These issues will increase should new
dictionary properties be introduced.
Rather than storing the subsystem and device properties in the
dict ring, introduce a struct dev_printk_info with separate fields
to store only the property values. Embed this struct within the
struct printk_info to provide guaranteed availability.
Signed-off-by: John Ogness <john.ogness@linutronix.de>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Signed-off-by: Petr Mladek <pmladek@suse.com>
Link: https://lore.kernel.org/r/87mu1jl6ne.fsf@jogness.linutronix.de
Diffstat (limited to 'scripts')
| -rw-r--r-- | scripts/gdb/linux/dmesg.py | 16 |
1 files changed, 11 insertions, 5 deletions
diff --git a/scripts/gdb/linux/dmesg.py b/scripts/gdb/linux/dmesg.py index bce14de5f610..a92c55bd8de5 100644 --- a/scripts/gdb/linux/dmesg.py +++ b/scripts/gdb/linux/dmesg.py @@ -52,6 +52,12 @@ class LxDmesg(gdb.Command): addr = utils.read_ulong(desc_ring, off) descs = utils.read_memoryview(inf, addr, desc_sz * desc_ring_count).tobytes() + # read in info array + info_sz = printk_info_type.get_type().sizeof + off = prb_desc_ring_type.get_type()['infos'].bitpos // 8 + addr = utils.read_ulong(desc_ring, off) + infos = utils.read_memoryview(inf, addr, info_sz * desc_ring_count).tobytes() + # read in text data ring structure off = printk_ringbuffer_type.get_type()['text_data_ring'].bitpos // 8 addr = prb_addr + off @@ -73,9 +79,8 @@ class LxDmesg(gdb.Command): begin_off = off + (prb_data_blk_lpos_type.get_type()['begin'].bitpos // 8) next_off = off + (prb_data_blk_lpos_type.get_type()['next'].bitpos // 8) - off = prb_desc_type.get_type()['info'].bitpos // 8 - ts_off = off + printk_info_type.get_type()['ts_nsec'].bitpos // 8 - len_off = off + printk_info_type.get_type()['text_len'].bitpos // 8 + ts_off = printk_info_type.get_type()['ts_nsec'].bitpos // 8 + len_off = printk_info_type.get_type()['text_len'].bitpos // 8 # definitions from kernel/printk/printk_ringbuffer.h desc_committed = 1 @@ -95,6 +100,7 @@ class LxDmesg(gdb.Command): while True: ind = did % desc_ring_count desc_off = desc_sz * ind + info_off = info_sz * ind # skip non-committed record state = 3 & (utils.read_u64(descs, desc_off + sv_off + @@ -119,7 +125,7 @@ class LxDmesg(gdb.Command): # skip over descriptor id text_start = begin + utils.get_long_type().sizeof - text_len = utils.read_u16(descs, desc_off + len_off) + text_len = utils.read_u16(infos, info_off + len_off) # handle truncated message if end - text_start < text_len: @@ -128,7 +134,7 @@ class LxDmesg(gdb.Command): text = text_data[text_start:text_start + text_len].decode( encoding='utf8', errors='replace') - time_stamp = utils.read_u64(descs, desc_off + ts_off) + time_stamp = utils.read_u64(infos, info_off + ts_off) for line in text.splitlines(): msg = u"[{time:12.6f}] {line}\n".format( |