As per Seth's suggestion, I tried ratelimiting the cma_alloc messages:
diff --git a/mm/cma.c b/mm/cma.c
index c7b39dd3b4f6..56d2a046f689 100644
--- a/mm/cma.c
+++ b/mm/cma.c
@@ -477,7 +477,7 @@ struct page *cma_alloc(struct cma *cma, size_t count,
unsigned int align,
page_kasan_tag_reset(page + i);
}
- if (ret && !no_warn) {
+ if (ret && !no_warn && printk_ratelimit()) {
pr_err("%s: alloc failed, req-size: %zu pages, ret: %d\n",
__func__, count, ret);
cma_debug_show_areas(cma);
This drops the cma_alloc error message count down from 10758 to 21.
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https://bugs.launchpad.net/bugs/1823753
Title:
arm64: cma_alloc errors at boot
Status in linux package in Ubuntu:
Confirmed
Bug description:
On some arm64 systems[*] we are seeing a spew of messages on the
console:
[ 19.534097] cma: cma_alloc: alloc failed, req-size: 64 pages, ret: -12
[ 19.534109] cma: cma_alloc: alloc failed, req-size: 16 pages, ret: -12
[ 19.534113] cma: cma_alloc: alloc failed, req-size: 64 pages, ret: -12
[ 19.534126] cma: cma_alloc: alloc failed, req-size: 16 pages, ret: -12
[ 19.534130] cma: cma_alloc: alloc failed, req-size: 64 pages, ret: -12
[ 19.534142] cma: cma_alloc: alloc failed, req-size: 16 pages, ret: -12
[ 19.534146] cma: cma_alloc: alloc failed, req-size: 64 pages, ret: -12
[ 19.534157] cma: cma_alloc: alloc failed, req-size: 16 pages, ret: -12
[ 19.534161] cma: cma_alloc: alloc failed, req-size: 64 pages, ret: -12
[ 19.534173] cma: cma_alloc: alloc failed, req-size: 16 pages, ret: -12
[ 19.534177] cma: cma_alloc: alloc failed, req-size: 64 pages, ret: -12
This appears to be non-fatal - impacted systems all eventually boot.
But, at least in the case of the HP m400, it slows down boot enough
that MAAS' default timeout will expire before completing deployment.
[*] Observed on a HiSilicon D06 w/ SMMU disabled in the BIOS, as well
as an HP m400 (APM X-Gene) cartridge - although, not on another one
that - in theory - should be identical.
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