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authorJack Steiner <steiner@sgi.com>2007-05-08 14:50:43 -0700
committerTony Luck <tony.luck@intel.com>2007-05-08 14:50:43 -0700
commit3be44b9cc33d26930cb3bb014f35f582c6522481 (patch)
tree09225c5f0fb4c6caa81bbdff216ec83a093e4d12 /arch/ia64/sn
parent8737d59579c5e61ea3d5da4bd63303159fd1cf7e (diff)
downloadlinux-3be44b9cc33d26930cb3bb014f35f582c6522481.tar.bz2
[IA64] Optional method to purge the TLB on SN systems
This patch adds an optional method for purging the TLB on SN IA64 systems. The change should not affect any non-SN system. Signed-off-by: Jack Steiner <steiner@sgi.com> Signed-off-by: Tony Luck <tony.luck@intel.com>
Diffstat (limited to 'arch/ia64/sn')
-rw-r--r--arch/ia64/sn/kernel/sn2/sn2_smp.c65
1 files changed, 60 insertions, 5 deletions
diff --git a/arch/ia64/sn/kernel/sn2/sn2_smp.c b/arch/ia64/sn/kernel/sn2/sn2_smp.c
index 601747b1e22a..5d318b579fb1 100644
--- a/arch/ia64/sn/kernel/sn2/sn2_smp.c
+++ b/arch/ia64/sn/kernel/sn2/sn2_smp.c
@@ -46,6 +46,9 @@ DECLARE_PER_CPU(struct ptc_stats, ptcstats);
static __cacheline_aligned DEFINE_SPINLOCK(sn2_global_ptc_lock);
+/* 0 = old algorithm (no IPI flushes), 1 = ipi deadlock flush, 2 = ipi instead of SHUB ptc, >2 = always ipi */
+static int sn2_flush_opt = 0;
+
extern unsigned long
sn2_ptc_deadlock_recovery_core(volatile unsigned long *, unsigned long,
volatile unsigned long *, unsigned long,
@@ -76,6 +79,8 @@ struct ptc_stats {
unsigned long shub_itc_clocks;
unsigned long shub_itc_clocks_max;
unsigned long shub_ptc_flushes_not_my_mm;
+ unsigned long shub_ipi_flushes;
+ unsigned long shub_ipi_flushes_itc_clocks;
};
#define sn2_ptctest 0
@@ -121,6 +126,18 @@ void sn_tlb_migrate_finish(struct mm_struct *mm)
flush_tlb_mm(mm);
}
+static void
+sn2_ipi_flush_all_tlb(struct mm_struct *mm)
+{
+ unsigned long itc;
+
+ itc = ia64_get_itc();
+ smp_flush_tlb_cpumask(mm->cpu_vm_mask);
+ itc = ia64_get_itc() - itc;
+ __get_cpu_var(ptcstats).shub_ipi_flushes_itc_clocks += itc;
+ __get_cpu_var(ptcstats).shub_ipi_flushes++;
+}
+
/**
* sn2_global_tlb_purge - globally purge translation cache of virtual address range
* @mm: mm_struct containing virtual address range
@@ -154,7 +171,12 @@ sn2_global_tlb_purge(struct mm_struct *mm, unsigned long start,
unsigned long itc, itc2, flags, data0 = 0, data1 = 0, rr_value, old_rr = 0;
short nasids[MAX_NUMNODES], nix;
nodemask_t nodes_flushed;
- int active, max_active, deadlock;
+ int active, max_active, deadlock, flush_opt = sn2_flush_opt;
+
+ if (flush_opt > 2) {
+ sn2_ipi_flush_all_tlb(mm);
+ return;
+ }
nodes_clear(nodes_flushed);
i = 0;
@@ -189,6 +211,12 @@ sn2_global_tlb_purge(struct mm_struct *mm, unsigned long start,
return;
}
+ if (flush_opt == 2) {
+ sn2_ipi_flush_all_tlb(mm);
+ preempt_enable();
+ return;
+ }
+
itc = ia64_get_itc();
nix = 0;
for_each_node_mask(cnode, nodes_flushed)
@@ -256,6 +284,8 @@ sn2_global_tlb_purge(struct mm_struct *mm, unsigned long start,
}
if (active >= max_active || i == (nix - 1)) {
if ((deadlock = wait_piowc())) {
+ if (flush_opt == 1)
+ goto done;
sn2_ptc_deadlock_recovery(nasids, ibegin, i, mynasid, ptc0, data0, ptc1, data1);
if (reset_max_active_on_deadlock())
max_active = 1;
@@ -267,6 +297,7 @@ sn2_global_tlb_purge(struct mm_struct *mm, unsigned long start,
start += (1UL << nbits);
} while (start < end);
+done:
itc2 = ia64_get_itc() - itc2;
__get_cpu_var(ptcstats).shub_itc_clocks += itc2;
if (itc2 > __get_cpu_var(ptcstats).shub_itc_clocks_max)
@@ -279,6 +310,11 @@ sn2_global_tlb_purge(struct mm_struct *mm, unsigned long start,
spin_unlock_irqrestore(PTC_LOCK(shub1), flags);
+ if (flush_opt == 1 && deadlock) {
+ __get_cpu_var(ptcstats).deadlocks++;
+ sn2_ipi_flush_all_tlb(mm);
+ }
+
preempt_enable();
}
@@ -425,24 +461,42 @@ static int sn2_ptc_seq_show(struct seq_file *file, void *data)
if (!cpu) {
seq_printf(file,
- "# cpu ptc_l newrid ptc_flushes nodes_flushed deadlocks lock_nsec shub_nsec shub_nsec_max not_my_mm deadlock2\n");
- seq_printf(file, "# ptctest %d\n", sn2_ptctest);
+ "# cpu ptc_l newrid ptc_flushes nodes_flushed deadlocks lock_nsec shub_nsec shub_nsec_max not_my_mm deadlock2 ipi_fluches ipi_nsec\n");
+ seq_printf(file, "# ptctest %d, flushopt %d\n", sn2_ptctest, sn2_flush_opt);
}
if (cpu < NR_CPUS && cpu_online(cpu)) {
stat = &per_cpu(ptcstats, cpu);
- seq_printf(file, "cpu %d %ld %ld %ld %ld %ld %ld %ld %ld %ld %ld\n", cpu, stat->ptc_l,
+ seq_printf(file, "cpu %d %ld %ld %ld %ld %ld %ld %ld %ld %ld %ld %ld %ld\n", cpu, stat->ptc_l,
stat->change_rid, stat->shub_ptc_flushes, stat->nodes_flushed,
stat->deadlocks,
1000 * stat->lock_itc_clocks / per_cpu(cpu_info, cpu).cyc_per_usec,
1000 * stat->shub_itc_clocks / per_cpu(cpu_info, cpu).cyc_per_usec,
1000 * stat->shub_itc_clocks_max / per_cpu(cpu_info, cpu).cyc_per_usec,
stat->shub_ptc_flushes_not_my_mm,
- stat->deadlocks2);
+ stat->deadlocks2,
+ stat->shub_ipi_flushes,
+ 1000 * stat->shub_ipi_flushes_itc_clocks / per_cpu(cpu_info, cpu).cyc_per_usec);
}
return 0;
}
+static ssize_t sn2_ptc_proc_write(struct file *file, const char __user *user, size_t count, loff_t *data)
+{
+ int cpu;
+ char optstr[64];
+
+ if (copy_from_user(optstr, user, count))
+ return -EFAULT;
+ optstr[count - 1] = '\0';
+ sn2_flush_opt = simple_strtoul(optstr, NULL, 0);
+
+ for_each_online_cpu(cpu)
+ memset(&per_cpu(ptcstats, cpu), 0, sizeof(struct ptc_stats));
+
+ return count;
+}
+
static struct seq_operations sn2_ptc_seq_ops = {
.start = sn2_ptc_seq_start,
.next = sn2_ptc_seq_next,
@@ -458,6 +512,7 @@ static int sn2_ptc_proc_open(struct inode *inode, struct file *file)
static const struct file_operations proc_sn2_ptc_operations = {
.open = sn2_ptc_proc_open,
.read = seq_read,
+ .write = sn2_ptc_proc_write,
.llseek = seq_lseek,
.release = seq_release,
};