[PATCH v1] printk: Improve memory usage logging during boot

From: Isaac J. Manjarres
Date: Wed Sep 25 2024 - 21:12:15 EST


When the initial printk ring buffer size is updated, setup_log_buf()
allocates a new ring buffer, as well as a set of meta-data structures
for the new ring buffer. The function also emits the new size of the
ring buffer, but not the size of the meta-data structures.

This makes it difficult to assess how changing the log buffer size
impacts memory usage during boot.

For instance, increasing the ring buffer size from 512 KB to 1 MB
through the command line yields an increase of 2304 KB in reserved
memory at boot, while the only obvious change is the 512 KB
difference in the ring buffer sizes:

log_buf_len=512K:

printk: log_buf_len: 524288 bytes
Memory: ... (... 733252K reserved ...)

log_buf_len=1M:

printk: log_buf_len: 1048576 bytes
Memory: ... (... 735556K reserved ...)

This is because of how the size of the meta-data structures scale with
the size of the ring buffer.

Even when there aren't changes to the printk ring buffer size (i.e. the
initial size == 1 << CONFIG_LOG_BUF_SHIFT), it is impossible to tell
how much memory is consumed by the printk ring buffer during boot.

Therefore, unconditionally log the sizes of the printk ring buffer
and its meta-data structures, so that it's easier to understand
how changing the log buffer size (either through the command line or
by changing CONFIG_LOG_BUF_SHIFT) affects boot time memory usage.

With the new logs, it is much easier to see exactly why the memory
increased by 2304 KB:

log_buf_len=512K:

printk: log_buf_len: 524288 bytes
printk: prb_descs size: 393216 bytes
printk: printk_infos size: 1441792 bytes
Memory: ... (... 733252K reserved ...)

log_buf_len=1M:

printk: log_buf_len: 1048576 bytes
printk: prb_descs size: 786432 bytes
printk: printk_infos size: 2883584 bytes
Memory: ... (... 735556K reserved ...)

Signed-off-by: Isaac J. Manjarres <isaacmanjarres@xxxxxxxxxx>
---
kernel/printk/printk.c | 21 +++++++++++++++++----
1 file changed, 17 insertions(+), 4 deletions(-)

diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c
index beb808f4c367..0c169c28fa37 100644
--- a/kernel/printk/printk.c
+++ b/kernel/printk/printk.c
@@ -1156,6 +1156,17 @@ static unsigned int __init add_to_rb(struct printk_ringbuffer *rb,

static char setup_text_buf[PRINTKRB_RECORD_MAX] __initdata;

+static void print_log_buf_usage_stats(void)
+{
+ unsigned int descs_count = log_buf_len >> PRB_AVGBITS;
+ size_t descs_size = descs_count * sizeof(struct prb_desc);
+ size_t infos_size = descs_count * sizeof(struct printk_info);
+
+ pr_info("log_buf_len: %u bytes\n", log_buf_len);
+ pr_info("prb_descs size: %zu bytes\n", descs_size);
+ pr_info("printk_infos size: %zu bytes\n", infos_size);
+}
+
void __init setup_log_buf(int early)
{
struct printk_info *new_infos;
@@ -1186,19 +1197,19 @@ void __init setup_log_buf(int early)
log_buf_add_cpu();

if (!new_log_buf_len)
- return;
+ goto out;

new_descs_count = new_log_buf_len >> PRB_AVGBITS;
if (new_descs_count == 0) {
pr_err("new_log_buf_len: %lu too small\n", new_log_buf_len);
- return;
+ goto out;
}

new_log_buf = memblock_alloc(new_log_buf_len, LOG_ALIGN);
if (unlikely(!new_log_buf)) {
pr_err("log_buf_len: %lu text bytes not available\n",
new_log_buf_len);
- return;
+ goto out;
}

new_descs_size = new_descs_count * sizeof(struct prb_desc);
@@ -1261,7 +1272,7 @@ void __init setup_log_buf(int early)
prb_next_seq(&printk_rb_static) - seq);
}

- pr_info("log_buf_len: %u bytes\n", log_buf_len);
+ print_log_buf_usage_stats();
pr_info("early log buf free: %u(%u%%)\n",
free, (free * 100) / __LOG_BUF_LEN);
return;
@@ -1270,6 +1281,8 @@ void __init setup_log_buf(int early)
memblock_free(new_descs, new_descs_size);
err_free_log_buf:
memblock_free(new_log_buf, new_log_buf_len);
+out:
+ print_log_buf_usage_stats();
}

static bool __read_mostly ignore_loglevel;
--
2.46.1.824.gd892dcdcdd-goog