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Revision 1.5 / (download) - annotate - [select for diffs], Tue Mar 26 00:53:51 2024 UTC (2 months, 2 weeks ago) by dlg
Branch: MAIN
CVS Tags: HEAD
Changes since 1.4: +5 -1 lines
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amps and watts types volts felt lonely
Revision 1.4 / (download) - annotate - [select for diffs], Thu Nov 16 02:45:20 2023 UTC (6 months, 3 weeks ago) by dlg
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CVS Tags: OPENBSD_7_5_BASE,
OPENBSD_7_5
Changes since 1.3: +6 -1 lines
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cpu frequency and volt types for kstat_kvs
Revision 1.3 / (download) - annotate - [select for diffs], Fri Apr 22 00:27:55 2022 UTC (2 years, 1 month ago) by dlg
Branch: MAIN
CVS Tags: OPENBSD_7_4_BASE,
OPENBSD_7_4,
OPENBSD_7_3_BASE,
OPENBSD_7_3,
OPENBSD_7_2_BASE,
OPENBSD_7_2
Changes since 1.2: +8 -1 lines
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add 16 bit types to kstat_kv structs. of course it is a realtek card that needs this because they provide some 16 bit counters.
Revision 1.2 / (download) - annotate - [select for diffs], Mon Jan 31 05:09:17 2022 UTC (2 years, 4 months ago) by dlg
Branch: MAIN
CVS Tags: OPENBSD_7_1_BASE,
OPENBSD_7_1
Changes since 1.1: +2 -1 lines
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add kstat_remove so you can tear the struct apart before kstat_destroy
Revision 1.1 / (download) - annotate - [select for diffs], Mon Jul 6 03:56:51 2020 UTC (3 years, 11 months ago) by dlg
Branch: MAIN
CVS Tags: OPENBSD_7_0_BASE,
OPENBSD_7_0,
OPENBSD_6_9_BASE,
OPENBSD_6_9,
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OPENBSD_6_8
add kstat(4), a subsystem to let the kernel expose statistics to userland. a kstat is an arbitrary chunk of data that a part of the kernel wants to expose to userland. data could mean just a chunk of raw bytes, but generally a kernel subsystem will provide a series of kstat key/value chunks. this code is loosely modelled on kstat in solaris, but with a bunch of simplifications (we don't want to provide write support for example). the named or key/value structure is significantly richer in this version too. eg, ssolaris kstat named data supports integer types, but this version offers differentiation between counters (like the number of packets transmitted on an interface) and gauges (like how long the transmit queue is) and lets kernel providers say what the units are (eg, packets vs bytes vs cycles). the main motivation for this is to improve the visibility of what the kernel is doing while it's running. i wrote this as part of the recent work we've been doing on multiqueue and rss/toeplitz so i could verify that network load is actually spread across multiple rings on a single nic. without this we would be wasting memory and interrupt vectors on multiple rings and still just using the 1st one, and noone would know cos there's no way to see what rings are being used. another thing that can become visible is the different counters that various network cards provide. i'm particularly interested in seeing if packets get dropped because the rings aren't filled fully, which is an effect we've never really observed directly. a small part of wanting this is cos i spend an annoying amount of time instrumenting the kernel when hacking code in it. if most of the scaffolding for the instrumentation is already there, i can avoid repeatedly writing that code and save time. iterated a few times with claudio@ and deraadt@