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13 Commits

Author SHA1 Message Date
glebius
d231df0ee2 Add kvm_getncpus() to obtain mp_ncpus. 
Sponsored by:	Nginx, Inc.
 2014-02-12 19:22:48 +00:00
glebius
25d59f119c While it isn't too late and kvm_read_zpcpu() function isn't yet used 
outside libkvm(3), change its order of arguments, so that it is the
same as in kvm_read().

Sponsored by:	Nginx, Inc.
 2014-02-12 09:41:17 +00:00
glebius
a87549c49c Revert r256514 for libkvm. It wasn't correct actually and breaks build. 2013-10-15 13:53:35 +00:00
glebius
53ef73d870 - While we are spreading the counter(9) across network stack, more userland 
tools would need to know about the counter_u64_t type. Allow to include
sys/counter.h from userspace.
- Utilize now defined type in kvm_counter_u64_fetch().

Sponsored by:	Netflix
Sponsored by:	Nginx, Inc.
 2013-10-15 10:05:37 +00:00
glebius
147dda2e5e o Provide function kvm_read_zpcpu() to access UMA_ZONE_PCPU allocations. 
o Provide function kvm_counter_u64_fetch() to fetch valut of a counter(9).

Sponsored by:	Nginx, Inc.
 2013-04-10 20:26:53 +00:00
attilio
364d0522f7 With retirement of cpumask_t and usage of cpuset_t for representing a 
mask of CPUs, pc_other_cpus and pc_cpumask become highly inefficient.

Remove them and replace their usage with custom pc_cpuid magic (as,
atm, pc_cpumask can be easilly represented by (1 << pc_cpuid) and
pc_other_cpus by (all_cpus & ~(1 << pc_cpuid))).

This change is not targeted for MFC because of struct pcpu members
removal and dependency by cpumask_t retirement.

MD review by:	marcel, marius, alc
Tested by:	pluknet
MD testing by:	marcel, marius, gonzo, andreast
 2011-07-04 12:04:52 +00:00
attilio
27825059cd Revert r222363, as bde@ pointed out the initial solution was far more 
correct.
 2011-05-31 20:59:53 +00:00
attilio
cc1bd831c1 Style fix: cast to size_t rather than u_long when comparing to sizeof() 
rets.

Requested by:	kib
 2011-05-27 16:01:51 +00:00
attilio
9a75ededfb In the near future cpuset_t objects in struct pcpu will be axed out, but 
as long as this does not happen, we need to fix interfaces to userland
in order to not break run-time accesses to the structure.

Reviwed by:	kib
Tested by:	pluknet
 2011-05-27 15:50:14 +00:00
uqs
7fdf187c11 libkvm code janitoring 
- make WARNS=6 clean for archs w/o strict alignment requirments
- add const, ANSIfy, remove unused vars, cast types for comparison
- thanks to differing definitions of VM_MIN_ADDRESS across our archs, we
  need to trick the compiler to not complain about signedness. We could
  either fix VM_MIN_ADDRESS to always be a simple integer or make the
  check conditional on $ARCH.

Closes PRs:	kern/42386, kern/83364
Reviewed by:	bde
 2011-01-23 11:08:28 +00:00
dim
756e9f5377 Similar to sys/net/vnet.h, define the linker set name for sys/sys/pcpu.h 
as a macro, and use it instead of literal strings.
 2010-11-14 20:14:25 +00:00
rwatson
2c2940cdf7 A first cut at teaching libkvm how to deal with dynamic per-CPU storage 
(DPCPU):

A new API, kvm_dpcpu_setcpu(3), selects the active CPU for the purposes
of DPCPU.  Calls to kvm_nlist(3) will automatically translate DPCPU
symbols and return a pointer to the current CPU's version of the data.
Consumers needing to read the same symbol on several CPUs will invoke a
series of setcpu/nlist calls, one per CPU of interest.

This addition makes it possible for tools like netstat(1) to query the
values of DPCPU variables during crashdump analysis, and is based on
similar code handling virtualized global variables.

MFC after:	1 week
Sponsored by:	Juniper Networks, Inc.
 2010-03-01 00:27:55 +00:00
jhb
78678aa46b Add two new routines to libkvm for working with per-CPU data: 
kvm_getmaxcpu() and kvm_getpcpu().

MFC after:	1 week
 2008-08-19 19:55:33 +00:00