diff options
| author | Alex Shi <alex.shi@intel.com> | 2012-06-28 09:02:19 +0800 |
|---|---|---|
| committer | H. Peter Anvin <hpa@zytor.com> | 2012-06-27 19:29:10 -0700 |
| commit | c4211f42d3e66875298a5e26a75109878c80f15b (patch) | |
| tree | 5f4db23b52be8eb74f95c35621373df790eacdd2 /arch/x86/kernel/cpu/intel.c | |
| parent | d8dfe60d6dcad5989c4558b753b98d657e2813c0 (diff) | |
x86/tlb: add tlb_flushall_shift for specific CPU
Testing show different CPU type(micro architectures and NUMA mode) has
different balance points between the TLB flush all and multiple invlpg.
And there also has cases the tlb flush change has no any help.
This patch give a interface to let x86 vendor developers have a chance
to set different shift for different CPU type.
like some machine in my hands, balance points is 16 entries on
Romely-EP; while it is at 8 entries on Bloomfield NHM-EP; and is 256 on
IVB mobile CPU. but on model 15 core2 Xeon using invlpg has nothing
help.
For untested machine, do a conservative optimization, same as NHM CPU.
Signed-off-by: Alex Shi <alex.shi@intel.com>
Link: http://lkml.kernel.org/r/1340845344-27557-5-git-send-email-alex.shi@intel.com
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Diffstat (limited to 'arch/x86/kernel/cpu/intel.c')
| -rw-r--r-- | arch/x86/kernel/cpu/intel.c | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/arch/x86/kernel/cpu/intel.c b/arch/x86/kernel/cpu/intel.c index ed0d512cf51b..0a4ce2980a5a 100644 --- a/arch/x86/kernel/cpu/intel.c +++ b/arch/x86/kernel/cpu/intel.c @@ -610,6 +610,39 @@ static void __cpuinit intel_tlb_lookup(const unsigned char desc) } } +static void __cpuinit intel_tlb_flushall_shift_set(struct cpuinfo_x86 *c) +{ + if (!cpu_has_invlpg) { + tlb_flushall_shift = -1; + return; + } + switch ((c->x86 << 8) + c->x86_model) { + case 0x60f: /* original 65 nm celeron/pentium/core2/xeon, "Merom"/"Conroe" */ + case 0x616: /* single-core 65 nm celeron/core2solo "Merom-L"/"Conroe-L" */ + case 0x617: /* current 45 nm celeron/core2/xeon "Penryn"/"Wolfdale" */ + case 0x61d: /* six-core 45 nm xeon "Dunnington" */ + tlb_flushall_shift = -1; + break; + case 0x61a: /* 45 nm nehalem, "Bloomfield" */ + case 0x61e: /* 45 nm nehalem, "Lynnfield" */ + case 0x625: /* 32 nm nehalem, "Clarkdale" */ + case 0x62c: /* 32 nm nehalem, "Gulftown" */ + case 0x62e: /* 45 nm nehalem-ex, "Beckton" */ + case 0x62f: /* 32 nm Xeon E7 */ + tlb_flushall_shift = 6; + break; + case 0x62a: /* SandyBridge */ + case 0x62d: /* SandyBridge, "Romely-EP" */ + tlb_flushall_shift = 5; + break; + case 0x63a: /* Ivybridge */ + tlb_flushall_shift = 1; + break; + default: + tlb_flushall_shift = 6; + } +} + static void __cpuinit intel_detect_tlb(struct cpuinfo_x86 *c) { int i, j, n; @@ -630,6 +663,7 @@ static void __cpuinit intel_detect_tlb(struct cpuinfo_x86 *c) for (j = 1 ; j < 16 ; j++) intel_tlb_lookup(desc[j]); } + intel_tlb_flushall_shift_set(c); } static const struct cpu_dev __cpuinitconst intel_cpu_dev = { |