Date: Tue, 18 Jan 2011 23:00:22 +0000 (UTC) From: Konstantin Belousov <kib@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r217564 - head/sys/amd64/amd64 Message-ID: <201101182300.p0IN0MJ4055088@svn.freebsd.org>
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Author: kib Date: Tue Jan 18 23:00:22 2011 New Revision: 217564 URL: http://svn.freebsd.org/changeset/base/217564 Log: Make the length of the LDT a loader tunable, machdep.max_ldt_segment, and export it with read-only sysctl. Remove unused defines. Reviewed by: jhb (previous version) MFC after: 1 week Modified: head/sys/amd64/amd64/sys_machdep.c Modified: head/sys/amd64/amd64/sys_machdep.c ============================================================================== --- head/sys/amd64/amd64/sys_machdep.c Tue Jan 18 22:56:10 2011 (r217563) +++ head/sys/amd64/amd64/sys_machdep.c Tue Jan 18 23:00:22 2011 (r217564) @@ -35,6 +35,7 @@ __FBSDID("$FreeBSD$"); #include <sys/param.h> #include <sys/systm.h> +#include <sys/kernel.h> #include <sys/lock.h> #include <sys/malloc.h> #include <sys/mutex.h> @@ -58,9 +59,24 @@ __FBSDID("$FreeBSD$"); #include <security/audit/audit.h> +#define MAX_LD 8192 + int max_ldt_segment = 1024; -#define LD_PER_PAGE 512 -#define NULL_LDT_BASE ((caddr_t)NULL) +SYSCTL_INT(_machdep, OID_AUTO, max_ldt_segment, CTLFLAG_RD, &max_ldt_segment, + 0, + "Maximum number of allowed LDT segments in the single address space"); + +static void +max_ldt_segment_init(void *arg __unused) +{ + + TUNABLE_INT_FETCH("machdep.max_ldt_segment", &max_ldt_segment); + if (max_ldt_segment <= 0) + max_ldt_segment = 1; + if (max_ldt_segment > MAX_LD) + max_ldt_segment = MAX_LD; +} +SYSINIT(maxldt, SI_SUB_VM_CONF, SI_ORDER_ANY, max_ldt_segment_init, NULL); #ifdef notyet #ifdef SMP
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