c0da433b0a
As the underlying block is 4KB if the PMC throughput is low the measurement will be reported on the next tick. pmcstat(8) use the modified flush API to reclaim current buffer before displaying next top. MFC after: 1 month
134 lines
3.5 KiB
Groff
134 lines
3.5 KiB
Groff
.\" Copyright (c) 2007 Joseph Koshy. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" This software is provided by Joseph Koshy ``as is'' and
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.\" any express or implied warranties, including, but not limited to, the
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.\" implied warranties of merchantability and fitness for a particular purpose
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.\" are disclaimed. in no event shall Joseph Koshy be liable
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.\" for any direct, indirect, incidental, special, exemplary, or consequential
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.\" damages (including, but not limited to, procurement of substitute goods
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.\" or services; loss of use, data, or profits; or business interruption)
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.\" however caused and on any theory of liability, whether in contract, strict
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.\" liability, or tort (including negligence or otherwise) arising in any way
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.\" out of the use of this software, even if advised of the possibility of
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.\" such damage.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd November 24, 2007
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.Dt PMC_CONFIGURE_LOGFILE 3
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.Os
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.Sh NAME
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.Nm pmc_configure_logfile ,
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.Nm pmc_flush_logfile ,
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.Nm pmc_writelog ,
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.Nm pmc_close_logfile
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.Nd log file management
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.Sh LIBRARY
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.Lb libpmc
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.Sh SYNOPSIS
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.In pmc.h
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.Ft int
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.Fn pmc_configure_logfile "int fd"
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.Ft int
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.Fn pmc_flush_logfile void
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.Ft int
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.Fn pmc_writelog "uint32_t userdata"
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.Ft int
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.Fn pmc_close_logfile void
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.Sh DESCRIPTION
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The functions manage logging of
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.Xr hwpmc 4
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events.
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.Pp
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Function
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.Fn pmc_configure_logfile
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is used to turn on and turn off logging.
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If argument
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.Fa fd
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is a valid file handle returned by a prior call to
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.Xr open 2
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or
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.Xr socket 2
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then performance events will be logged to the file corresponding
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to the specified handle.
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If the value of argument
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.Fa fd
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is -1 then logging will be stopped after any pending data is flushed.
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.Pp
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Function
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.Fn pmc_flush_logfile
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will force all log data queued inside the
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.Xr hwpmc 4
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driver to be written out.
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.Pp
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Function
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.Fn pmc_writelog
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will append a log entry containing the value of argument
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.Fa userdata
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to the log file.
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.Pp
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Function
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.Fn pmc_close_logfile
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will flush all pending log data and close
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.Xr hwpmc 4 Ns Ap s
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side of the stream.
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.Sh RETURN VALUES
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.Rv -std
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.Sh ERRORS
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A call to
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.Fn pmc_configure_logfile
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may fail with the following errors:
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.Bl -tag -width Er
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.It Bq Er EAGAIN
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The
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.Xr hwpmc 4
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driver was not able to create a helper process due to system limits
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being reached.
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.It Bq Er EBUSY
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Function
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.Fn pmc_configure_logfile
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was called with a log file already configured.
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.It Bq Er EINVAL
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Function
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.Fn pmc_configure_logfile
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was called with an argument of -1 without a log file being previously
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configured.
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.It Bq Er ENOMEM
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The system encountered a memory shortage when servicing this request.
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.El
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.Pp
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A call to
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.Fn pmc_flush_logfile
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may fail with the following errors:
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.Bl -tag -width Er
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.It Bq Er EINVAL
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Function
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.Fn pmc_flush_logfile
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was called without a log file being previously configured.
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.El
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.Pp
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A call to
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.Fn pmc_writelog
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may fail with the following errors:
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.Bl -tag -width Er
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.It Bq Er EINVAL
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Function
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.Fn pmc_writelog
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was called without a log file being previously configured.
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.It Bq Er ENOMEM
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The system encountered a memory shortage when servicing this
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request.
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.El
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.Sh SEE ALSO
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.Xr pmc 3 ,
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.Xr hwpmc 4
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