Date: Fri, 1 Jun 2012 04:42:52 +0000 (UTC) From: Eitan Adler <eadler@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r236380 - head/sys/vm Message-ID: <201206010442.q514gqqv084148@svn.freebsd.org>
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Author: eadler Date: Fri Jun 1 04:42:52 2012 New Revision: 236380 URL: http://svn.freebsd.org/changeset/base/236380 Log: Add sysctl to query amount of swap space free PR: kern/166780 Submitted by: Radim Kolar <hsn@sendmail.cz> Approved by: cperciva MFC after: 1 week Modified: head/sys/vm/swap_pager.c Modified: head/sys/vm/swap_pager.c ============================================================================== --- head/sys/vm/swap_pager.c Fri Jun 1 04:34:49 2012 (r236379) +++ head/sys/vm/swap_pager.c Fri Jun 1 04:42:52 2012 (r236380) @@ -2692,3 +2692,18 @@ swaponvp(struct thread *td, struct vnode NODEV); return (0); } + +static int +sysctl_vm_swap_free(SYSCTL_HANDLER_ARGS) { + int swap_free, used; + int total; + + swap_pager_status(&total, &used); + + swap_free = (total - used) * PAGE_SIZE; + return SYSCTL_OUT(req, &swap_free, sizeof(swap_free)); +} + +SYSCTL_OID(_vm, OID_AUTO, swap_free, CTLTYPE_INT|CTLFLAG_RD|CTLFLAG_MPSAFE, + NULL, 0, sysctl_vm_swap_free, "Q", + "Blocks of free swap storage.");
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