FreeBSD Bugzilla – Attachment 172215 Details for
Bug 210904
Added CAVEATS section to the kinfo_getvmmap(3) man page explaining the high CPU consumption
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[patch]
patch
kinfo_getvmmap.3.patch (text/plain), 676 bytes, created by
Yuri Victorovich
on 2016-07-07 22:18:58 UTC
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patch
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Creator:
Yuri Victorovich
Created:
2016-07-07 22:18:58 UTC
Size:
676 bytes
patch
obsolete
>Index: lib/libutil/kinfo_getvmmap.3 >=================================================================== >--- lib/libutil/kinfo_getvmmap.3 (revision 301975) >+++ lib/libutil/kinfo_getvmmap.3 (working copy) >@@ -58,6 +58,13 @@ > mib. > While the kernel returns a packed structure, this function expands the > data into a fixed record format. >+.Sh CAVEAT >+.Fn kinfo_getvmmap >+calls can cause significant CPU consumption due to the residency count >+calculation which requires the iteration over all memory pages of the >+process. Setting the sysctl variable >+.Va kern.proc_vmmap_skip_resident_count >+to 1 prevents this calculation. > .Sh RETURN VALUES > On success the > .Fn kinfo_getvmmap
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bug 210904
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