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[IA64] Kernel parameter for max number of concurrent global TLB purges

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The patch defines kernel parameter "nptcg=". The parameter overrides max number
of concurrent global TLB purges which is reported from either PAL_VM_SUMMARY or
SAL PALO.

Signed-off-by: Fenghua Yu <fenghua.yu@intel.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
This commit is contained in:
Fenghua Yu
2008-03-14 13:57:08 -07:00
committed by Tony Luck
parent 2046b94e7c
commit a6c75b86ce
5 changed files with 51 additions and 7 deletions
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2
arch/ia64/kernel/setup.c
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@@ -949,7 +949,7 @@ cpu_init (void)
/* set ia64_ctx.max_rid to the maximum RID that is supported by all CPUs: */
if (ia64_pal_vm_summary(NULL, &vmi) == 0) {
max_ctx = (1U << (vmi.pal_vm_info_2_s.rid_size - 3)) - 1;
setup_ptcg_sem(vmi.pal_vm_info_2_s.max_purges, 0);
setup_ptcg_sem(vmi.pal_vm_info_2_s.max_purges, NPTCG_FROM_PAL);
} else {
printk(KERN_WARNING "cpu_init: PAL VM summary failed, assuming 18 RID bits\n");
max_ctx = (1U << 15) - 1; /* use architected minimum */