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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> | 2023-04-06 04:42:55 +0200 |
| commit | bd23024b9774e681cbe6cc3afcb24244dfcb2390 (patch) | |
| tree | 660d52ca5ef5b776a2299b5a189add72d34c39c9 /mm/memtest.c | |
| parent | MAINTAINERS: extend memblock entry to include MM initialization (diff) | |
| download | linux-bd23024b9774e681cbe6cc3afcb24244dfcb2390.tar.xz 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 'mm/memtest.c')
| -rw-r--r-- | mm/memtest.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/mm/memtest.c b/mm/memtest.c index f53ace709ccd..57149dfee438 100644 --- a/mm/memtest.c +++ b/mm/memtest.c @@ -4,6 +4,9 @@ #include <linux/init.h> #include <linux/memblock.h> +bool early_memtest_done; +phys_addr_t early_memtest_bad_size; + static u64 patterns[] __initdata = { /* The first entry has to be 0 to leave memtest with zeroed memory */ 0, @@ -30,6 +33,7 @@ static void __init reserve_bad_mem(u64 pattern, phys_addr_t start_bad, phys_addr pr_info(" %016llx bad mem addr %pa - %pa reserved\n", cpu_to_be64(pattern), &start_bad, &end_bad); memblock_reserve(start_bad, end_bad - start_bad); + early_memtest_bad_size += (end_bad - start_bad); } static void __init memtest(u64 pattern, phys_addr_t start_phys, phys_addr_t size) @@ -61,6 +65,8 @@ static void __init memtest(u64 pattern, phys_addr_t start_phys, phys_addr_t size } if (start_bad) reserve_bad_mem(pattern, start_bad, last_bad + incr); + + early_memtest_done = true; } static void __init do_one_pass(u64 pattern, phys_addr_t start, phys_addr_t end) |