46a31fdf25
- Backport: Update syscall lists for Linux 6.8 - Backport: Update kernel version to 6.8 in header constant tests - Backport: Update syscall lists for Linux 6.9 - Backport: Update PIDFD_* constants for Linux 6.9 - Backport: Update kernel version to 6.9 in header constant tests - Backport: linux: add definitions for hugetlb page size encodings - Backport: Update syscall lists for Linux 6.10 - Backport: Update kernel version to 6.10 in header constant tests - Backport: Linux: Add missing scheduler constants to <sched.h> - Backport: Update syscall lists for Linux 6.11 - Backport: Update PIDFD_* constants for Linux 6.11 - Backport: linux: Add MAP_DROPPABLE from Linux 6.11 - Backport: Update kernel version to 6.11 in header constant tests - Backport: Update syscall lists for Linux 6.12 - Backport: Update kernel version to 6.12 in header constant tests - Backport: Add SCHED_EXT from Linux 6.12 to bits/sched.h - Backport: Update syscall lists for Linux 6.13 - Backport: Update kernel version to 6.13 in header constant tests - Backport: Update syscall lists for Linux 6.14 - Backport: Update syscall lists for Linux 6.15 Resolves: RHEL-107695
62 lines
2.5 KiB
Diff
62 lines
2.5 KiB
Diff
commit f6e849fd7ce2a8954022bd23b94703975b3db0d1
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Author: Adhemerval Zanella <adhemerval.zanella@linaro.org>
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Date: Tue Oct 8 15:45:26 2024 -0300
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linux: Add MAP_DROPPABLE from Linux 6.11
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This request the page to be never written out to swap, it will be zeroed
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under memory pressure (so kernel can just drop the page), it is inherited
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by fork, it is not counted against @code{mlock} budget, and if there is
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no enough memory to service a page faults there is no fatal error (so not
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signal is sent).
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Tested with build-many-glibcs.py.
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Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
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diff --git a/manual/llio.texi b/manual/llio.texi
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index 17fe1181d5cc2cef..a8ed72c5db6ecba9 100644
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--- a/manual/llio.texi
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+++ b/manual/llio.texi
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@@ -1647,6 +1647,15 @@ The @code{MAP_HUGETLB} flag is specific to Linux.
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@c user programs (and I don't understand the last two). MAP_LOCKED does
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@c not appear to be implemented.
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+@item MAP_DROPPABLE
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+Request the page to be never written out to swap, it will be zeroed
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+under memory pressure (so kernel can just drop the page), it is inherited
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+by fork, it is not counted against @code{mlock} budget, and if there is
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+not enough memory to service a page fault there is no fatal error (so no
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+signal is sent).
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+
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+The @code{MAP_DROPPABLE} flag is specific to Linux.
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+
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@end vtable
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@code{mmap} returns the address of the new mapping, or
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diff --git a/sysdeps/unix/sysv/linux/bits/mman-linux.h b/sysdeps/unix/sysv/linux/bits/mman-linux.h
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index 522333c50a04481d..161a88509682cf69 100644
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--- a/sysdeps/unix/sysv/linux/bits/mman-linux.h
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+++ b/sysdeps/unix/sysv/linux/bits/mman-linux.h
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@@ -43,6 +43,7 @@
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#define MAP_PRIVATE 0x02 /* Changes are private. */
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#define MAP_SHARED_VALIDATE 0x03 /* Share changes and validate
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extension flags. */
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+#define MAP_DROPPABLE 0x08 /* Zero memory under memory pressure. */
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#define MAP_TYPE 0x0f /* Mask for type of mapping. */
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/* Other flags. */
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diff --git a/sysdeps/unix/sysv/linux/tst-mman-consts.py b/sysdeps/unix/sysv/linux/tst-mman-consts.py
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index a1137eb1d59d95ec..2191bea36f8f69e0 100644
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--- a/sysdeps/unix/sysv/linux/tst-mman-consts.py
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+++ b/sysdeps/unix/sysv/linux/tst-mman-consts.py
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@@ -33,7 +33,7 @@ def main():
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help='C compiler (including options) to use')
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args = parser.parse_args()
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linux_version_headers = glibcsyscalls.linux_kernel_version(args.cc)
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- linux_version_glibc = (6, 10)
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+ linux_version_glibc = (6, 11)
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sys.exit(glibcextract.compare_macro_consts(
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'#define _GNU_SOURCE 1\n'
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'#include <sys/mman.h>\n',
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