Date: Thu, 26 Mar 2015 05:20:19 +0000 (UTC) From: Rui Paulo <rpaulo@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r280665 - head/sys/vm Message-ID: <201503260520.t2Q5KJ6G041751@svn.freebsd.org>
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Author: rpaulo Date: Thu Mar 26 05:20:18 2015 New Revision: 280665 URL: https://svnweb.freebsd.org/changeset/base/280665 Log: Add comments about CTLFLAG_RDTUN vs. TUNABLE_INT_FETCH. Requested by: julian Modified: head/sys/vm/memguard.c head/sys/vm/vm_page.c Modified: head/sys/vm/memguard.c ============================================================================== --- head/sys/vm/memguard.c Thu Mar 26 05:18:17 2015 (r280664) +++ head/sys/vm/memguard.c Thu Mar 26 05:20:18 2015 (r280665) @@ -69,7 +69,7 @@ static SYSCTL_NODE(_vm, OID_AUTO, memgua static u_int vm_memguard_divisor; SYSCTL_UINT(_vm_memguard, OID_AUTO, divisor, CTLFLAG_RDTUN | CTLFLAG_NOFETCH, &vm_memguard_divisor, - 0, "(kmem_size/memguard_divisor) == memguard submap size"); + 0, "(kmem_size/memguard_divisor) == memguard submap size"); /* * Short description (ks_shortdesc) of memory type to monitor. @@ -162,6 +162,7 @@ memguard_fudge(unsigned long km_size, co u_long mem_pgs, parent_size; vm_memguard_divisor = 10; + /* CTFLAG_RDTUN doesn't work during the early boot process. */ TUNABLE_INT_FETCH("vm.memguard.divisor", &vm_memguard_divisor); parent_size = vm_map_max(parent_map) - vm_map_min(parent_map) + Modified: head/sys/vm/vm_page.c ============================================================================== --- head/sys/vm/vm_page.c Thu Mar 26 05:18:17 2015 (r280664) +++ head/sys/vm/vm_page.c Thu Mar 26 05:20:18 2015 (r280665) @@ -349,6 +349,9 @@ vm_page_startup(vm_offset_t vaddr) /* * Allocate memory for use when boot strapping the kernel memory * allocator. + * + * CTFLAG_RDTUN doesn't work during the early boot process, so we must + * manually fetch the value. */ TUNABLE_INT_FETCH("vm.boot_pages", &boot_pages); new_end = end - (boot_pages * UMA_SLAB_SIZE);
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