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-.\" Copyright (C) 2006 Red Hat, Inc. All Rights Reserved.
-.\" and Copyright (C) 2013 Michael Kerrisk <mtk.manpages@gmail.com>
-.\" Written by Ivana Varekova <varekova@redhat.com>
-.\"
-.\" SPDX-License-Identifier: Linux-man-pages-copyleft
-.\"
-.TH perfmonctl 2 2023-10-31 "Linux man-pages 6.7"
-.SH NAME
-perfmonctl \- interface to IA-64 performance monitoring unit
-.SH SYNOPSIS
-.nf
-.B #include <syscall.h>
-.B #include <perfmon.h>
-.P
-.BI "long perfmonctl(int " fd ", int " cmd ", void " arg [. narg "], int " narg ");"
-.fi
-.P
-.IR Note :
-There is no glibc wrapper for this system call; see HISTORY.
-.SH DESCRIPTION
-The IA-64-specific
-.BR perfmonctl ()
-system call provides an interface to the
-PMU (performance monitoring unit).
-The PMU consists of PMD (performance monitoring data) registers and
-PMC (performance monitoring control) registers,
-which gather hardware statistics.
-.P
-.BR perfmonctl ()
-applies the operation
-.I cmd
-to the input arguments specified by
-.IR arg .
-The number of arguments is defined by \fInarg\fR.
-The
-.I fd
-argument specifies the perfmon context to operate on.
-.P
-Supported values for
-.I cmd
-are:
-.TP
-.B PFM_CREATE_CONTEXT
-.nf
-.BI  "perfmonctl(int " fd ", PFM_CREATE_CONTEXT, pfarg_context_t *" ctxt ", 1);"
-.fi
-Set up a context.
-.IP
-The
-.I fd
-parameter is ignored.
-A new perfmon context is created as specified in
-.I ctxt
-and its file descriptor is returned in \fIctxt\->ctx_fd\fR.
-.IP
-The file descriptor can be used in subsequent calls to
-.BR perfmonctl ()
-and can be used to read event notifications (type
-.IR pfm_msg_t )
-using
-.BR read (2).
-The file descriptor is pollable using
-.BR select (2),
-.BR poll (2),
-and
-.BR epoll (7).
-.IP
-The context can be destroyed by calling
-.BR close (2)
-on the file descriptor.
-.TP
-.B PFM_WRITE_PMCS
-.\" pfm_write_pmcs()
-.nf
-.BI  "perfmonctl(int " fd ", PFM_WRITE_PMCS, pfarg_reg_t *" pmcs ", n);"
-.fi
-Set PMC registers.
-.TP
-.B PFM_WRITE_PMDS
-.nf
-.BI  "perfmonctl(int " fd ", PFM_WRITE_PMDS, pfarg_reg_t *" pmds ", n);"
-.fi
-.\" pfm_write_pmds()
-Set PMD registers.
-.TP
-.B PFM_READ_PMDS
-.\" pfm_read_pmds()
-.nf
-.BI  "perfmonctl(int " fd ", PFM_READ_PMDS, pfarg_reg_t *" pmds ", n);"
-.fi
-Read PMD registers.
-.TP
-.B PFM_START
-.\" pfm_start()
-.nf
-.\" .BI  "perfmonctl(int " fd ", PFM_START, arg, 1);
-.BI  "perfmonctl(int " fd ", PFM_START, NULL, 0);"
-.fi
-Start monitoring.
-.TP
-.B PFM_STOP
-.\" pfm_stop()
-.nf
-.BI  "perfmonctl(int " fd ", PFM_STOP, NULL, 0);"
-.fi
-Stop monitoring.
-.TP
-.B PFM_LOAD_CONTEXT
-.\" pfm_context_load()
-.nf
-.BI  "perfmonctl(int " fd ", PFM_LOAD_CONTEXT, pfarg_load_t *" largs ", 1);"
-.fi
-Attach the context to a thread.
-.TP
-.B PFM_UNLOAD_CONTEXT
-.\" pfm_context_unload()
-.nf
-.BI  "perfmonctl(int " fd ", PFM_UNLOAD_CONTEXT, NULL, 0);"
-.fi
-Detach the context from a thread.
-.TP
-.B PFM_RESTART
-.\" pfm_restart()
-.nf
-.BI  "perfmonctl(int " fd ", PFM_RESTART, NULL, 0);"
-.fi
-Restart monitoring after receiving an overflow notification.
-.TP
-.B PFM_GET_FEATURES
-.\" pfm_get_features()
-.nf
-.BI  "perfmonctl(int " fd ", PFM_GET_FEATURES, pfarg_features_t *" arg ", 1);"
-.fi
-.TP
-.B PFM_DEBUG
-.\" pfm_debug()
-.nf
-.BI  "perfmonctl(int " fd ", PFM_DEBUG, " val ", 0);"
-.fi
-If
-.I val
-is nonzero, enable debugging mode, otherwise disable.
-.TP
-.B PFM_GET_PMC_RESET_VAL
-.\" pfm_get_pmc_reset()
-.nf
-.BI  "perfmonctl(int " fd ", PFM_GET_PMC_RESET_VAL, pfarg_reg_t *" req  ", n);"
-.fi
-Reset PMC registers to default values.
-.\"
-.\"
-.\" .TP
-.\" .B PFM_CREATE_EVTSETS
-.\"
-.\" create or modify event sets
-.\" .nf
-.\" .BI  "perfmonctl(int " fd ", PFM_CREATE_EVTSETS, pfarg_setdesc_t *desc , n);
-.\" .fi
-.\" .TP
-.\" .B PFM_DELETE_EVTSETS
-.\" delete event sets
-.\" .nf
-.\" .BI  "perfmonctl(int " fd ", PFM_DELETE_EVTSET, pfarg_setdesc_t *desc , n);
-.\" .fi
-.\" .TP
-.\" .B PFM_GETINFO_EVTSETS
-.\" get information about event sets
-.\" .nf
-.\" .BI  "perfmonctl(int " fd ", PFM_GETINFO_EVTSETS, pfarg_setinfo_t *info, n);
-.\" .fi
-.SH RETURN VALUE
-.BR perfmonctl ()
-returns zero when the operation is successful.
-On error, \-1 is returned and
-.I errno
-is set to indicate the error.
-.SH STANDARDS
-Linux on IA-64.
-.SH HISTORY
-Added in Linux 2.4;
-.\" commit ecf5b72d5f66af843f189dfe9ce31598c3e48ad7
-removed in Linux 5.10.
-.P
-This system call was broken for many years,
-and ultimately removed in Linux 5.10.
-.P
-glibc does not provide a wrapper for this system call;
-on kernels where it exists, call it using
-.BR syscall (2).
-.SH SEE ALSO
-.BR gprof (1)
-.P
-The perfmon2 interface specification