2000-01-14 07:57:47 +00:00
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# $FreeBSD$
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1998-09-15 07:23:21 +01:00
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LIB= devstat
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2003-08-18 16:25:39 +01:00
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SHLIBDIR?= /lib
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Run a revision of the devstat interface:
Kernel:
Change statistics to use the *uptime() timescale (ie: relative to
boottime) rather than the UTC aligned timescale. This makes the
device statistics code oblivious to clock steps.
Change timestamps to bintime format, they are cheaper.
Remove the "busy_count", and replace it with two counter fields:
"start_count" and "end_count", which are updated in the down and
up paths respectively. This removes the locking constraint on
devstat.
Add a timestamp argument to devstat_start_transaction(), this will
normally be a timestamp set by the *_bio() function in bp->bio_t0.
Use this field to calculate duration of I/O operations.
Add two timestamp arguments to devstat_end_transaction(), one is
the current time, a NULL pointer means "take timestamp yourself",
the other is the timestamp of when this transaction started (see
above).
Change calculation of busy_time to operate on "the salami principle":
Only when we are idle, which we can determine by the start+end
counts being identical, do we update the "busy_from" field in the
down path. In the up path we accumulate the timeslice in busy_time
and update busy_from.
Change the byte_* and num_* fields into two arrays: bytes[] and
operations[].
Userland:
Change the misleading "busy_time" name to be called "snap_time" and
make the time long double since that is what most users need anyway,
fill it using clock_gettime(CLOCK_MONOTONIC) to put it on the same
timescale as the kernel fields.
Change devstat_compute_etime() to operate on struct bintime.
Remove the version 2 legacy interface: the change to bintime makes
compatibility far too expensive.
Fix a bug in systat's "vm" page where boot relative busy times would
be bogus.
Bump __FreeBSD_version to 500107
Review & Collaboration by: ken
2003-03-15 21:59:06 +00:00
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# Bump DEVSTAT_USER_API_VER in devstat.h every time this is incremented.
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2007-05-21 03:49:08 +01:00
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SHLIB_MAJOR= 6
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1998-09-15 07:23:21 +01:00
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SRCS= devstat.c
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2000-01-14 07:57:47 +00:00
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INCS= devstat.h
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1998-09-15 07:23:21 +01:00
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2004-02-05 22:44:25 +00:00
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DPADD= ${LIBKVM}
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LDADD= -lkvm
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2001-08-04 19:25:48 +01:00
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2001-03-27 18:27:19 +01:00
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MAN= devstat.3
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1998-09-15 07:23:21 +01:00
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2001-08-04 19:25:48 +01:00
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MLINKS+=devstat.3 devstat_getnumdevs.3
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MLINKS+=devstat.3 devstat_getgeneration.3
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MLINKS+=devstat.3 devstat_getversion.3
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MLINKS+=devstat.3 devstat_checkversion.3
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MLINKS+=devstat.3 devstat_getdevs.3
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MLINKS+=devstat.3 devstat_selectdevs.3
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MLINKS+=devstat.3 devstat_buildmatch.3
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MLINKS+=devstat.3 devstat_compute_statistics.3
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MLINKS+=devstat.3 devstat_compute_etime.3
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1999-01-06 05:00:17 +00:00
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MLINKS+=devstat.3 getnumdevs.3
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MLINKS+=devstat.3 getgeneration.3
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MLINKS+=devstat.3 getversion.3
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MLINKS+=devstat.3 checkversion.3
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MLINKS+=devstat.3 getdevs.3
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MLINKS+=devstat.3 selectdevs.3
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MLINKS+=devstat.3 buildmatch.3
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MLINKS+=devstat.3 compute_stats.3
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MLINKS+=devstat.3 compute_etime.3
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2001-05-18 14:41:42 +01:00
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CFLAGS+=-I${.CURDIR}
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1998-09-15 07:23:21 +01:00
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2001-09-24 00:03:23 +01:00
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WARNS?= 2
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1998-09-15 07:23:21 +01:00
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.include <bsd.lib.mk>
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