7194d335cf
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
40 lines
941 B
Makefile
40 lines
941 B
Makefile
# $FreeBSD$
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MAINTAINER=ken@FreeBSD.ORG
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LIB= devstat
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# Bump DEVSTAT_USER_API_VER in devstat.h every time this is incremented.
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SHLIB_MAJOR= 4
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SRCS= devstat.c
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INCS= devstat.h
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DPADD+= ${LIBKVM}
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LDADD+= -lkvm
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MAN= devstat.3
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MLINKS+=devstat.3 devstat_getnumdevs.3
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MLINKS+=devstat.3 devstat_getgeneration.3
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MLINKS+=devstat.3 devstat_getversion.3
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MLINKS+=devstat.3 devstat_checkversion.3
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MLINKS+=devstat.3 devstat_getdevs.3
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MLINKS+=devstat.3 devstat_selectdevs.3
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MLINKS+=devstat.3 devstat_buildmatch.3
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MLINKS+=devstat.3 devstat_compute_statistics.3
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MLINKS+=devstat.3 devstat_compute_etime.3
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MLINKS+=devstat.3 getnumdevs.3
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MLINKS+=devstat.3 getgeneration.3
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MLINKS+=devstat.3 getversion.3
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MLINKS+=devstat.3 checkversion.3
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MLINKS+=devstat.3 getdevs.3
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MLINKS+=devstat.3 selectdevs.3
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MLINKS+=devstat.3 buildmatch.3
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MLINKS+=devstat.3 compute_stats.3
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MLINKS+=devstat.3 compute_etime.3
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CFLAGS+=-I${.CURDIR}
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WARNS?= 2
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.include <bsd.lib.mk>
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