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| author | phk <phk@FreeBSD.org> | 2003-03-15 21:59:06 +0000 |
|---|---|---|
| committer | phk <phk@FreeBSD.org> | 2003-03-15 21:59:06 +0000 |
| commit | f432014308d6b21386e15affbbca62043615671d (patch) | |
| tree | c322a33c0275fefd9ca33cd377e3d6f459cb9a8c /lib/libdevstat/Makefile | |
| parent | d16675cd85efe1cde6bf077376276f3de06f0263 (diff) | |
| download | FreeBSD-src-f432014308d6b21386e15affbbca62043615671d.zip FreeBSD-src-f432014308d6b21386e15affbbca62043615671d.tar.gz | |
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
Diffstat (limited to 'lib/libdevstat/Makefile')
| -rw-r--r-- | lib/libdevstat/Makefile | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/lib/libdevstat/Makefile b/lib/libdevstat/Makefile index 5d484bf..3c7454e 100644 --- a/lib/libdevstat/Makefile +++ b/lib/libdevstat/Makefile @@ -3,7 +3,8 @@ MAINTAINER=ken@FreeBSD.ORG LIB= devstat -SHLIB_MAJOR= 3 +# Bump DEVSTAT_USER_API_VER in devstat.h every time this is incremented. +SHLIB_MAJOR= 4 SRCS= devstat.c INCS= devstat.h |
