Author: sevan (doc committer) Date: Sun Mar 25 01:34:44 2018 New Revision: 331518 URL: https://svnweb.freebsd.org/changeset/base/331518
Log: MFC r322665 Add caveat to kinfo_getvmmap(3) explaining high CPU utilisation. Based on kib's reply on https://lists.freebsd.org/pipermail/freebsd-hackers/2016-July/049710.html Modified: stable/11/lib/libutil/kinfo_getvmmap.3 Directory Properties: stable/11/ (props changed) Modified: stable/11/lib/libutil/kinfo_getvmmap.3 ============================================================================== --- stable/11/lib/libutil/kinfo_getvmmap.3 Sun Mar 25 01:33:51 2018 (r331517) +++ stable/11/lib/libutil/kinfo_getvmmap.3 Sun Mar 25 01:34:44 2018 (r331518) @@ -25,7 +25,7 @@ .\" .\" $FreeBSD$ .\" -.Dd May 27, 2015 +.Dd August 18, 2017 .Dt KINFO_GETVMMAP 3 .Os .Sh NAME @@ -58,6 +58,13 @@ with the 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 because calculating the residency +counts requires iterating 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 _______________________________________________ svn-src-all@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-all To unsubscribe, send any mail to "svn-src-all-unsubscr...@freebsd.org"
