diff options
| author | JP Kobryn <jp.kobryn@linux.dev> | 2026-06-22 11:51:27 -0700 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2026-07-28 21:11:45 -0700 |
| commit | 094470f3f45b9efdab2c6b27f920071e29ebf5c5 (patch) | |
| tree | 6390889dc9abce18f78d8a19612df58baf61c14b /include | |
| parent | 4ac732c3705c218ce5da83cd6a4597b0e5f7df51 (diff) | |
mm/lruvec: trace LRU add drains and drain-all requests
LRU add batches can be drained before they reach capacity. This can be a
source of LRU lock contention, but it is not currently possible to
attribute these drains to callers with existing tracepoints.
Add mm_lru_add_drain to report the CPU and lru_add batch count when an
lru_add batch is drained. This allows tracing to distinguish full drains
from partial drains and attribute them to the calling stack.
Add mm_lru_add_drain_all to capture callers of __lru_add_drain_all and
whether they set the force flag for all CPUs. The tracepoint resembles
the signature of the enclosing function, but is needed because of
potential inlining.
Note that DECLARE_TRACE() is used for these new trace hooks to avoid
creating a new trace event ABI.
Link: https://lore.kernel.org/20260622185127.24579-1-jp.kobryn@linux.dev
Signed-off-by: JP Kobryn <jp.kobryn@linux.dev>
Reviewed-by: Barry Song <baohua@kernel.org>
Acked-by: Shakeel Butt <shakeel.butt@linux.dev>
Cc: Axel Rasmussen <axelrasmussen@google.com>
Cc: Baoquan He <baoquan.he@linux.dev>
Cc: Chris Li <chrisl@kernel.org>
Cc: Kairui Song <kasong@tencent.com>
Cc: Kemeng Shi <shikemeng@huaweicloud.com>
Cc: "Masami Hiramatsu (Google)" <mhiramat@kernel.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Nhat Pham <nphamcs@gmail.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Vlastimil Babka <vbabka@kernel.org>
Cc: Wei Xu <weixugc@google.com>
Cc: Yuanchu Xie <yuanchu@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/trace/events/pagemap.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/include/trace/events/pagemap.h b/include/trace/events/pagemap.h index 171524d3526d..36c3a90f0acc 100644 --- a/include/trace/events/pagemap.h +++ b/include/trace/events/pagemap.h @@ -77,6 +77,14 @@ TRACE_EVENT(mm_lru_activate, TP_printk("folio=%p pfn=0x%lx", __entry->folio, __entry->pfn) ); +DECLARE_TRACE(mm_lru_add_drain, + TP_PROTO(int cpu, unsigned int nr_folios), + TP_ARGS(cpu, nr_folios)); + +DECLARE_TRACE(mm_lru_add_drain_all, + TP_PROTO(bool force_all_cpus), + TP_ARGS(force_all_cpus)); + #endif /* _TRACE_PAGEMAP_H */ /* This part must be outside protection */ |