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mm/cma: add 'available count' and 'total count' to trace_cma_alloc_start

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This makes cma info more intuitive during debugging.

Show up in the trace as:

	279.814717: cma_alloc_start: name=reserved request_count=4 available_count=8096 total_count=8192 align=0
	309.790580: cma_alloc_start: name=reserved request_count=4 available_count=8092 total_count=8192 align=0
	317.046609: cma_alloc_start: name=reserved request_count=4 available_count=8088 total_count=8192 align=0

Link: https://lkml.kernel.org/r/8a79284879c529f467478552825154b018076e95.1755729178.git.gaoxiang17@xiaomi.com
Signed-off-by: gaoxiang17 <gaoxiang17@xiaomi.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Liam Howlett <liam.howlett@oracle.com>
Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
gaoxiang17
2025-08-21 06:38:55 +08:00
committed by Andrew Morton
parent 5d5d75ff64
commit 0cd01c4a5c
2 changed files with 14 additions and 7 deletions
Download Patch File Download Diff File Expand all files Collapse all files

19
include/trace/events/cma.h
View File

@@ -38,25 +38,32 @@ TRACE_EVENT(cma_release,
TRACE_EVENT(cma_alloc_start,
TP_PROTO(const char *name, unsigned long count, unsigned int align),
TP_PROTO(const char *name, unsigned long request_count, unsigned long available_count,
unsigned long total_count, unsigned int align),
TP_ARGS(name, count, align),
TP_ARGS(name, request_count, available_count, total_count, align),
TP_STRUCT__entry(
__string(name, name)
__field(unsigned long, count)
__field(unsigned long, request_count)
__field(unsigned long, available_count)
__field(unsigned long, total_count)
__field(unsigned int, align)
),
TP_fast_assign(
__assign_str(name);
__entry->count = count;
__entry->request_count = request_count;
__entry->available_count = available_count;
__entry->total_count = total_count;
__entry->align = align;
),
TP_printk("name=%s count=%lu align=%u",
TP_printk("name=%s request_count=%lu available_count=%lu total_count=%lu align=%u",
__get_str(name),
__entry->count,
__entry->request_count,
__entry->available_count,
__entry->total_count,
__entry->align)
);

2
mm/cma.c
View File

@@ -864,7 +864,7 @@ static struct page *__cma_alloc(struct cma *cma, unsigned long count,
if (!count)
return page;
trace_cma_alloc_start(name, count, align);
trace_cma_alloc_start(name, count, cma->available_count, cma->count, align);
for (r = 0; r < cma->nranges; r++) {
page = NULL;