Date: Mon, 11 Mar 2019 00:52:55 +0000 (UTC) From: Mark Johnston <markj@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-12@freebsd.org Subject: svn commit: r344988 - in stable/12/sys: kern vm Message-ID: <201903110052.x2B0qtaf074348@repo.freebsd.org>
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Author: markj Date: Mon Mar 11 00:52:55 2019 New Revision: 344988 URL: https://svnweb.freebsd.org/changeset/base/344988 Log: MFC r344550: Improve vmem tuning for platforms without a direct map. Modified: stable/12/sys/kern/subr_vmem.c stable/12/sys/vm/vm_kern.c Directory Properties: stable/12/ (props changed) Modified: stable/12/sys/kern/subr_vmem.c ============================================================================== --- stable/12/sys/kern/subr_vmem.c Sun Mar 10 23:05:38 2019 (r344987) +++ stable/12/sys/kern/subr_vmem.c Mon Mar 11 00:52:55 2019 (r344988) @@ -689,9 +689,11 @@ vmem_startup(void) /* * Reserve enough tags to allocate new tags. We allow multiple * CPUs to attempt to allocate new tags concurrently to limit - * false restarts in UMA. + * false restarts in UMA. vmem_bt_alloc() allocates from a per-domain + * arena, which may involve importing a range from the kernel arena, + * so we need to keep at least 2 * BT_MAXALLOC tags reserved. */ - uma_zone_reserve(vmem_bt_zone, BT_MAXALLOC * (mp_ncpus + 1) / 2); + uma_zone_reserve(vmem_bt_zone, 2 * BT_MAXALLOC * mp_ncpus); uma_zone_set_allocf(vmem_bt_zone, vmem_bt_alloc); #endif } Modified: stable/12/sys/vm/vm_kern.c ============================================================================== --- stable/12/sys/vm/vm_kern.c Sun Mar 10 23:05:38 2019 (r344987) +++ stable/12/sys/vm/vm_kern.c Mon Mar 11 00:52:55 2019 (r344988) @@ -124,8 +124,8 @@ SYSCTL_ULONG(_vm, OID_AUTO, max_kernel_address, CTLFLA #if VM_NRESERVLEVEL > 0 #define KVA_QUANTUM_SHIFT (VM_LEVEL_0_ORDER + PAGE_SHIFT) #else -/* On non-superpage architectures want large import sizes. */ -#define KVA_QUANTUM_SHIFT (10 + PAGE_SHIFT) +/* On non-superpage architectures we want large import sizes. */ +#define KVA_QUANTUM_SHIFT (8 + PAGE_SHIFT) #endif #define KVA_QUANTUM (1 << KVA_QUANTUM_SHIFT)
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