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gru: collect per-context user statistics

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Collect GRU statistics for each user GRU context.  Statistics are kept for
TLB misses & content resource contention.  Add user request for retrieving
the statistics.

Signed-off-by: Jack Steiner <steiner@sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Jack Steiner
2009-06-17 16:28:30 -07:00
committed by Linus Torvalds
parent d6e2fbce0d
commit 7e796a72a2
5 changed files with 52 additions and 0 deletions
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27
drivers/misc/sgi-gru/grufault.c
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@@ -498,6 +498,7 @@ irqreturn_t gru_intr(int irq, void *dev_id)
*/
if (!gts->ts_force_cch_reload &&
down_read_trylock(&gts->ts_mm->mmap_sem)) {
gts->ustats.fmm_tlbdropin++;
gru_try_dropin(gts, tfh, NULL);
up_read(&gts->ts_mm->mmap_sem);
} else {
@@ -516,6 +517,7 @@ static int gru_user_dropin(struct gru_thread_state *gts,
struct gru_mm_struct *gms = gts->ts_gms;
int ret;
gts->ustats.upm_tlbdropin++;
while (1) {
wait_event(gms->ms_wait_queue,
atomic_read(&gms->ms_range_active) == 0);
@@ -718,6 +720,31 @@ int gru_user_flush_tlb(unsigned long arg)
return 0;
}
/*
* Fetch GSEG statisticss
*/
long gru_get_gseg_statistics(unsigned long arg)
{
struct gru_thread_state *gts;
struct gru_get_gseg_statistics_req req;
if (copy_from_user(&req, (void __user *)arg, sizeof(req)))
return -EFAULT;
gts = gru_find_lock_gts(req.gseg);
if (gts) {
memcpy(&req.stats, &gts->ustats, sizeof(gts->ustats));
gru_unlock_gts(gts);
} else {
memset(&req.stats, 0, sizeof(gts->ustats));
}
if (copy_to_user((void __user *)arg, &req, sizeof(req)))
return -EFAULT;
return 0;
}
/*
* Register the current task as the user of the GSEG slice.
* Needed for TLB fault interrupt targeting.