scripts/gdb: lx-dmesg: read records individually

For the gdb command lx-dmesg, the entire descriptor, info, and text
data regions are read into memory before printing any records. For
large kernel log buffers, this not only causes a huge delay before
seeing any records, but it may also lead to python errors of too
much memory allocation.

Rather than reading in all these regions in advance, read them as
needed and only read the regions for the particular record that is
being printed.

The gdb macro "dmesg" in Documentation/admin-guide/kdump/gdbmacros.txt
already prints out the kernel log buffer like this.

Signed-off-by: John Ogness <[email protected]>
Signed-off-by: Petr Mladek <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

Author: jogness

scripts/gdb/linux/dmesg.py

@@ -44,32 +44,29 @@ def invoke(self, arg, from_tty):
         sz = prb_desc_ring_type.get_type().sizeof
         desc_ring = utils.read_memoryview(inf, addr, sz).tobytes()
 
-        # read in descriptor array
+        # read in descriptor count, size, and address
         off = prb_desc_ring_type.get_type()['count_bits'].bitpos // 8
         desc_ring_count = 1 << utils.read_u32(desc_ring, off)
         desc_sz = prb_desc_type.get_type().sizeof
         off = prb_desc_ring_type.get_type()['descs'].bitpos // 8
-        addr = utils.read_ulong(desc_ring, off)
-        descs = utils.read_memoryview(inf, addr, desc_sz * desc_ring_count).tobytes()
+        desc_addr = utils.read_ulong(desc_ring, off)
 
-        # read in info array
+        # read in info size and address
         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()
+        info_addr = utils.read_ulong(desc_ring, off)
 
         # read in text data ring structure
         off = printk_ringbuffer_type.get_type()['text_data_ring'].bitpos // 8
         addr = prb_addr + off
         sz = prb_data_ring_type.get_type().sizeof
         text_data_ring = utils.read_memoryview(inf, addr, sz).tobytes()
 
-        # read in text data
+        # read in text data size and address
         off = prb_data_ring_type.get_type()['size_bits'].bitpos // 8
         text_data_sz = 1 << utils.read_u32(text_data_ring, off)
         off = prb_data_ring_type.get_type()['data'].bitpos // 8
-        addr = utils.read_ulong(text_data_ring, off)
-        text_data = utils.read_memoryview(inf, addr, text_data_sz).tobytes()
+        text_data_addr = utils.read_ulong(text_data_ring, off)
 
         counter_off = atomic_long_type.get_type()['counter'].bitpos // 8
 
@@ -102,17 +99,20 @@ def invoke(self, arg, from_tty):
             desc_off = desc_sz * ind
             info_off = info_sz * ind
 
+            desc = utils.read_memoryview(inf, desc_addr + desc_off, desc_sz).tobytes()
+
             # skip non-committed record
-            state = 3 & (utils.read_u64(descs, desc_off + sv_off +
-                                        counter_off) >> desc_flags_shift)
+            state = 3 & (utils.read_u64(desc, sv_off + counter_off) >> desc_flags_shift)
             if state != desc_committed and state != desc_finalized:
                 if did == head_id:
                     break
                 did = (did + 1) & desc_id_mask
                 continue
 
-            begin = utils.read_ulong(descs, desc_off + begin_off) % text_data_sz
-            end = utils.read_ulong(descs, desc_off + next_off) % text_data_sz
+            begin = utils.read_ulong(desc, begin_off) % text_data_sz
+            end = utils.read_ulong(desc, next_off) % text_data_sz
+
+            info = utils.read_memoryview(inf, info_addr + info_off, info_sz).tobytes()
 
             # handle data-less record
             if begin & 1 == 1:
@@ -125,16 +125,17 @@ def invoke(self, arg, from_tty):
                 # skip over descriptor id
                 text_start = begin + utils.get_long_type().sizeof
 
-                text_len = utils.read_u16(infos, info_off + len_off)
+                text_len = utils.read_u16(info, len_off)
 
                 # handle truncated message
                 if end - text_start < text_len:
                     text_len = end - text_start
 
-                text = text_data[text_start:text_start + text_len].decode(
-                    encoding='utf8', errors='replace')
+                text_data = utils.read_memoryview(inf, text_data_addr + text_start,
+                                                  text_len).tobytes()
+                text = text_data[0:text_len].decode(encoding='utf8', errors='replace')
 
-            time_stamp = utils.read_u64(infos, info_off + ts_off)
+            time_stamp = utils.read_u64(info, ts_off)
 
             for line in text.splitlines():
                 msg = u"[{time:12.6f}] {line}\n".format(