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DAMON_STAT calculates the idle time of a region using the region's age if the region's nr_accesses is zero. If the nr_accesses value is non-zero (positive), the idle time of the region becomes zero. This means the users cannot know how warm and hot data is distributed, using DAMON_STAT's memory_idle_ms_percentiles output. The other stat, namely estimated_memory_bandwidth, can help understanding how the overall access temperature of the system is, but it is still very rough information. On production systems, actually, a significant portion of the system memory is observed with zero idle time, and we cannot break it down based on its internal hotness distribution. Define the idle time of the region using its age, similar to those having zero nr_accesses, but multiples '-1' to distinguish it. And expose that using the same parameter interface, memory_idle_ms_percentiles. Link: https://lkml.kernel.org/r/20250916183127.65708-3-sj@kernel.org Signed-off-by: SeongJae Park <sj@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> |
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| Documentation | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| io_uring | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
| mm | ||
| net | ||
| rust | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .clippy.toml | ||
| .cocciconfig | ||
| .editorconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| .pylintrc | ||
| .rustfmt.toml | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| README | ||
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.