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author | Mitchell Horne <mhorne@FreeBSD.org> | 2021-04-21 20:27:49 +0000 |
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committer | Mitchell Horne <mhorne@FreeBSD.org> | 2021-04-21 20:35:03 +0000 |
commit | 50f6c139970084adeefec98c658645c34b72209e (patch) | |
tree | 30bf94dd105c1155c5d99e4a225d5fadd2254482 | |
parent | 01d74fe1ffc32dc7f42dc0fb0c4861276a6b2bd2 (diff) | |
download | src-50f6c139970084adeefec98c658645c34b72209e.tar.gz src-50f6c139970084adeefec98c658645c34b72209e.zip |
pmc_allocate(3): document the count argument
This was added in b2ca2e50b9aa, and serves to provide an initial value
to the PMC, eliminating the need for a second syscall via pmc_set(3).
Reviewed by: gnn, 0mp (manpages)
MFC after: 1 week
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D29885
-rw-r--r-- | lib/libpmc/pmc_allocate.3 | 17 |
1 files changed, 16 insertions, 1 deletions
diff --git a/lib/libpmc/pmc_allocate.3 b/lib/libpmc/pmc_allocate.3 index 291ca8ac0113..515b427cf7bc 100644 --- a/lib/libpmc/pmc_allocate.3 +++ b/lib/libpmc/pmc_allocate.3 @@ -23,7 +23,7 @@ .\" .\" $FreeBSD$ .\" -.Dd September 22, 2008 +.Dd April 21, 2021 .Dt PMC_ALLOCATE 3 .Os .Sh NAME @@ -41,6 +41,7 @@ .Fa "uint32_t flags" .Fa "int cpu" .Fa "pmc_id_t *pmcid" +.Fa "uint64_t count" .Fc .Ft int .Fn pmc_release "pmc_id_t pmc" @@ -111,6 +112,20 @@ Process scope PMC allocations should specify the constant .Dv PMC_CPU_ANY for this argument. .Pp +The +.Fa count +argument behaves identically to the +.Xr pmc_set 3 +function's +.Fa value +argument. +For counting PMCs, +.Fa count +specifies the initial value of the allocated PMC. +For sampling PMCs, +.Fa count +specifies the reload count. +.Pp Function .Fn pmc_release releases the PMC denoted by argument |