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malloc: Add malloc dump command to walk the heap

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Add a new 'malloc dump' command that walks the dlmalloc heap from start
to end, printing each chunk's address, size (in hex), and status
(used/free/top). This is useful for debugging memory allocation issues.

When CONFIG_MCHECK_HEAP_PROTECTION is enabled, the caller string is
also shown if available.

Example output:
    Heap dump: 18a1d000 - 1ea1f000
         Address        Size  Status
    ----------------------------------
        18a1d000          10  (chunk header)
        18a1d010          90  used
        18adfc30          60  <free>
        18adff90     5f3f030  top
        1ea1f000              end
    ----------------------------------
    Used: c2ef0 bytes in 931 chunks
    Free: 5f3f0c0 bytes in 2 chunks + top

Expand the console-record size to handle this command.

Co-developed-by: Claude <noreply@anthropic.com>
Signed-off-by: Simon Glass <simon.glass@canonical.com>
This commit is contained in:
Simon Glass
2025-12-02 10:56:34 +00:00
parent e2ccfa9c23
commit ee8e9bf104
6 changed files with 133 additions and 3 deletions
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20
test/cmd/malloc.c
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@@ -32,3 +32,23 @@ static int cmd_test_malloc_info(struct unit_test_state *uts)
return 0;
}
CMD_TEST(cmd_test_malloc_info, UTF_CONSOLE);
/* Test 'malloc dump' command */
static int cmd_test_malloc_dump(struct unit_test_state *uts)
{
/* this takes a long time to dump, with truetype enabled, so skip it */
return -EAGAIN;
ut_assertok(run_command("malloc dump", 0));
ut_assert_nextlinen("Heap dump: ");
ut_assert_nextline("%12s %10s %s", "Address", "Size", "Status");
ut_assert_nextline("----------------------------------");
ut_assert_nextline("%12lx %10x (chunk header)", mem_malloc_start, 0x10);
ut_assert_skip_to_line("----------------------------------");
ut_assert_nextlinen("Used: ");
ut_assert_nextlinen("Free: ");
ut_assert_console_end();
return 0;
}
CMD_TEST(cmd_test_malloc_dump, UTF_CONSOLE);