linux-kernel - Re: [PATCH v2 3/3] mm/page_alloc: Add trace event for totalreserve

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Message-ID: <273ca5ee-c01b-83d3-6bbd-21ec4401e78b@google.com>
Date: Sun, 9 Mar 2025 17:54:16 -0700 (PDT)
From: David Rientjes <rientjes@...gle.com>
To: Martin Liu <liumartin@...gle.com>
cc: Steven Rostedt <rostedt@...dmis.org>, 
    Masami Hiramatsu <mhiramat@...nel.org>, 
    Mathieu Desnoyers <mathieu.desnoyers@...icios.com>, 
    Andrew Morton <akpm@...ux-foundation.org>, linux-kernel@...r.kernel.org, 
    linux-trace-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH v2 3/3] mm/page_alloc: Add trace event for totalreserve_pages
 calculation

On Sat, 8 Mar 2025, Martin Liu wrote:

> 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.
> 
> Signed-off-by: Martin Liu <liumartin@...gle.com>

Acked-by: David Rientjes <rientjes@...gle.com>