Date: Thu, 6 Aug 2015 21:27:51 +0000 (UTC) From: Alan Cox <alc@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r286390 - head/sys/vm Message-ID: <201508062127.t76LRpOi039327@repo.freebsd.org>
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Author: alc Date: Thu Aug 6 21:27:50 2015 New Revision: 286390 URL: https://svnweb.freebsd.org/changeset/base/286390 Log: Introduce a sysctl for reporting the number of fully populated reservations. Modified: head/sys/vm/vm_reserv.c Modified: head/sys/vm/vm_reserv.c ============================================================================== --- head/sys/vm/vm_reserv.c Thu Aug 6 20:59:03 2015 (r286389) +++ head/sys/vm/vm_reserv.c Thu Aug 6 21:27:50 2015 (r286390) @@ -217,6 +217,11 @@ static long vm_reserv_freed; SYSCTL_LONG(_vm_reserv, OID_AUTO, freed, CTLFLAG_RD, &vm_reserv_freed, 0, "Cumulative number of freed reservations"); +static int sysctl_vm_reserv_fullpop(SYSCTL_HANDLER_ARGS); + +SYSCTL_PROC(_vm_reserv, OID_AUTO, fullpop, CTLTYPE_INT | CTLFLAG_RD, NULL, 0, + sysctl_vm_reserv_fullpop, "I", "Current number of full reservations"); + static int sysctl_vm_reserv_partpopq(SYSCTL_HANDLER_ARGS); SYSCTL_OID(_vm_reserv, OID_AUTO, partpopq, CTLTYPE_STRING | CTLFLAG_RD, NULL, 0, @@ -235,6 +240,33 @@ static void vm_reserv_populate(vm_reser static void vm_reserv_reclaim(vm_reserv_t rv); /* + * Returns the current number of full reservations. + * + * Since the number of full reservations is computed without acquiring the + * free page queue lock, the returned value may be inexact. + */ +static int +sysctl_vm_reserv_fullpop(SYSCTL_HANDLER_ARGS) +{ + vm_paddr_t paddr; + struct vm_phys_seg *seg; + vm_reserv_t rv; + int fullpop, segind; + + fullpop = 0; + for (segind = 0; segind < vm_phys_nsegs; segind++) { + seg = &vm_phys_segs[segind]; + paddr = roundup2(seg->start, VM_LEVEL_0_SIZE); + while (paddr + VM_LEVEL_0_SIZE <= seg->end) { + rv = &vm_reserv_array[paddr >> VM_LEVEL_0_SHIFT]; + fullpop += rv->popcnt == VM_LEVEL_0_NPAGES; + paddr += VM_LEVEL_0_SIZE; + } + } + return (sysctl_handle_int(oidp, &fullpop, 0, req)); +} + +/* * Describes the current state of the partially-populated reservation queue. */ static int
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