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| author |  Tomas Mudrunka <tomas.mudrunka@gmail.com>
| 2023-03-21 11:34:30 +0100 |
|---|---|---|
| committer |  Andrew Morton <akpm@linux-foundation.org>
| 2023-04-05 19:42:55 -0700 |
| commit | bd23024b9774e681cbe6cc3afcb24244dfcb2390 (patch) | |
| tree | 660d52ca5ef5b776a2299b5a189add72d34c39c9 /fs/proc | |
| parent | MAINTAINERS: extend memblock entry to include MM initialization (diff) | |
| download | linux-bd23024b9774e681cbe6cc3afcb24244dfcb2390.tar.gz linux-bd23024b9774e681cbe6cc3afcb24244dfcb2390.tar.bz2 linux-bd23024b9774e681cbe6cc3afcb24244dfcb2390.zip | |
mm/memtest: add results of early memtest to /proc/meminfo
Currently the memtest results were only presented in dmesg.
When running a large fleet of devices without ECC RAM it's currently not
easy to do bulk monitoring for memory corruption. You have to parse
dmesg, but that's a ring buffer so the error might disappear after some
time. In general I do not consider dmesg to be a great API to query RAM
status.
In several companies I've seen such errors remain undetected and cause
issues for way too long. So I think it makes sense to provide a
monitoring API, so that we can safely detect and act upon them.
This adds /proc/meminfo entry which can be easily used by scripts.
Link: https://lkml.kernel.org/r/20230321103430.7130-1-tomas.mudrunka@gmail.com
Signed-off-by: Tomas Mudrunka <tomas.mudrunka@gmail.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Mike Rapoport (IBM) <rppt@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'fs/proc')
| -rw-r--r-- | fs/proc/meminfo.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/fs/proc/meminfo.c b/fs/proc/meminfo.c index 440960110a42..b43d0bd42762 100644 --- a/fs/proc/meminfo.c +++ b/fs/proc/meminfo.c @@ -6,6 +6,7 @@ #include <linux/hugetlb.h> #include <linux/mman.h> #include <linux/mmzone.h> +#include <linux/memblock.h> #include <linux/proc_fs.h> #include <linux/percpu.h> #include <linux/seq_file.h> @@ -131,6 +132,18 @@ static int meminfo_proc_show(struct seq_file *m, void *v) show_val_kb(m, "VmallocChunk: ", 0ul); show_val_kb(m, "Percpu: ", pcpu_nr_pages()); +#ifdef CONFIG_MEMTEST + if (early_memtest_done) { + unsigned long early_memtest_bad_size_kb; + + early_memtest_bad_size_kb = early_memtest_bad_size>>10; + if (early_memtest_bad_size && !early_memtest_bad_size_kb) + early_memtest_bad_size_kb = 1; + /* When 0 is reported, it means there actually was a successful test */ + seq_printf(m, "EarlyMemtestBad: %5lu kB\n", early_memtest_bad_size_kb); + } +#endif + #ifdef CONFIG_MEMORY_FAILURE seq_printf(m, "HardwareCorrupted: %5lu kB\n", atomic_long_read(&num_poisoned_pages) << (PAGE_SHIFT - 10)); |