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mm/page_alloc: add trace event for totalreserve_pages calculation

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This commit introduces a new trace event,
`mm_calculate_totalreserve_pages`, which reports the new reserve value at
the exact time when it takes effect.

The `totalreserve_pages` value represents the total amount of memory
reserved across all zones and nodes in the system.  This reserved memory
is crucial for ensuring that critical kernel operations have access to
sufficient memory, even under memory pressure.

By tracing the `totalreserve_pages` value, developers can gain insights
that how the total reserved memory changes over time.

Link: https://lkml.kernel.org/r/20250308034606.2036033-4-liumartin@google.com
Signed-off-by: Martin Liu <liumartin@google.com>
Acked-by: David Rientjes <rientjes@google.com>
Cc: "Masami Hiramatsu (Google)" <mhiramat@kernel.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Martin Liu
2025-03-08 03:46:02 +00:00
committed by Andrew Morton
parent a293aba4a5
commit 15766485e4
2 changed files with 19 additions and 0 deletions
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18
include/trace/events/kmem.h
View File

@@ -402,6 +402,24 @@ TRACE_EVENT(mm_setup_per_zone_lowmem_reserve,
__entry->lowmem_reserve)
);
TRACE_EVENT(mm_calculate_totalreserve_pages,
TP_PROTO(unsigned long totalreserve_pages),
TP_ARGS(totalreserve_pages),
TP_STRUCT__entry(
__field(unsigned long, totalreserve_pages)
),
TP_fast_assign(
__entry->totalreserve_pages = totalreserve_pages;
),
TP_printk("totalreserve_pages=%lu", __entry->totalreserve_pages)
);
/*
* Required for uniquely and securely identifying mm in rss_stat tracepoint.
*/

1
mm/page_alloc.c
View File

@@ -5914,6 +5914,7 @@ static void calculate_totalreserve_pages(void)
}
}
totalreserve_pages = reserve_pages;
trace_mm_calculate_totalreserve_pages(totalreserve_pages);
}
/*