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NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | STANDARDS | HISTORY | SEE ALSO | COLOPHON |
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PR_SET_IO_FLUSHER(2const) PR_SET_IO_FLUSHER(2const)
PR_SET_IO_FLUSHER - change the IO_FLUSHER state
Standard C library (libc, -lc)
#include <linux/prctl.h> /* Definition of PR_* constants */
#include <sys/prctl.h>
int prctl(PR_SET_IO_FLUSHER, long state, 0L, 0L, 0L);
If a user process is involved in the block layer or filesystem I/O
path, and can allocate memory while processing I/O requests it
must set state to 1. This will put the process in the IO_FLUSHER
state, which allows it special treatment to make progress when
allocating memory. If state is 0, the process will clear the
IO_FLUSHER state, and the default behavior will be used.
The calling process must have the CAP_SYS_RESOURCE capability.
The IO_FLUSHER state is inherited by a child process created via
fork(2) and is preserved across execve(2).
Examples of IO_FLUSHER applications are FUSE daemons, SCSI device
emulation daemons, and daemons that perform error handling like
multipath path recovery applications.
On success, 0 is returned. On error, -1 is returned, and errno is
set to indicate the error.
EINVAL state is not a valid value.
Linux.
Linux 5.6.
prctl(2), PR_GET_IO_FLUSHER(2const)
This page is part of the man-pages (Linux kernel and C library
user-space interface documentation) project. Information about
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⟨https://www.kernel.org/doc/man-pages/⟩. If you have a bug report
for this manual page, see
⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.
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2025-08-11. If you discover any rendering problems in this HTML
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Linux man-pages 6.15 2025-05-17 PR_SET_IO_FLUSHER(2const)
Pages that refer to this page: prctl(2), PR_GET_IO_FLUSHER(2const)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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