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Patch series "Add tracepoints for lowmem reserves, watermarks and totalreserve_pages", v2. This patchset introduces tracepoints to track changes in the lowmem reserves, watermarks and totalreserve_pages. This helps to track the exact timing of such changes and understand their relation to reclaim activities. The tracepoints added are: mm_setup_per_zone_lowmem_reserve mm_setup_per_zone_wmarks mm_calculate_totalreserve_pagesi This patch (of 3): This commit introduces the `mm_setup_per_zone_wmarks` trace event, which provides detailed insights into the kernel's per-zone watermark configuration, offering precise timing and the ability to correlate watermark changes with specific kernel events. While `/proc/zoneinfo` provides some information about zone watermarks, this trace event offers: 1. The ability to link watermark changes to specific kernel events and logic. 2. The ability to capture rapid or short-lived changes in watermarks that may be missed by user-space polling 3. Diagnosing unexpected kswapd activity or excessive direct reclaim triggered by rapidly changing watermarks. Link: https://lkml.kernel.org/r/20250308034606.2036033-1-liumartin@google.com Link: https://lkml.kernel.org/r/20250308034606.2036033-2-liumartin@google.com Signed-off-by: Martin Liu <liumartin@google.com> Acked-by: David Rientjes <rientjes@google.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Martin Liu <liumartin@google.com> Cc: "Masami Hiramatsu (Google)" <mhiramat@kernel.org> Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.