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Linux kernel source tree
cc864ebba5
The purpose is stopping splitting large folios whose mapcount are 2 or above. Folios whose estimated_shares = 0 should be still perfect and even better candidates than estimated_shares = 1. Consider a pte-mapped large folio with 16 subpages, if we unmap 1-15, the current code will split folios and reclaim them while madvise goes on this folio; but if we unmap subpage 0, we will keep this folio and break. This is weird. For pmd-mapped large folios, we can still use "= 1" as the condition as anyway we have the entire map for it. So this patch doesn't change the condition for pmd-mapped large folios. This also explains why we had been using "= 1" for both pmd-mapped and pte-mapped large folios before commit |
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| arch | ||
| block | ||
| certs | ||
| crypto | ||
| Documentation | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| io_uring | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
| mm | ||
| net | ||
| rust | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .cocciconfig | ||
| .editorconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| .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 Restructured Text 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.