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Subject[Patch 03/25] GRU - update gru tlb miss statistics
From: Jack Steiner <steiner@sgi.com>

Update the GRU TLB dropin statistics. Add counts to indicate
number of TLB miss interrupts and a separate count of TLB
entries actually written. Also minor code cleanup of the TLB fault path.


Signed-off-by: Jack Steiner <steiner@sgi.com>

---
drivers/misc/sgi-gru/gru.h | 3 ++-
drivers/misc/sgi-gru/grufault.c | 33 +++++++++++++++++++++++++--------
drivers/misc/sgi-gru/gruprocfs.c | 1 +
drivers/misc/sgi-gru/grutables.h | 1 +
4 files changed, 29 insertions(+), 9 deletions(-)
Index: linux/drivers/misc/sgi-gru/gru.h
===================================================================
--- linux.orig/drivers/misc/sgi-gru/gru.h 2010-06-09 08:11:31.372037434 -0500
+++ linux/drivers/misc/sgi-gru/gru.h 2010-06-09 08:11:40.281083913 -0500
@@ -61,7 +61,8 @@ struct gru_gseg_statistics {
unsigned long upm_tlbmiss;
unsigned long tlbdropin;
unsigned long context_stolen;
- unsigned long reserved[10];
+ unsigned long interrupts;
+ unsigned long reserved[9];
};

/* Flags for GRU options on the gru_create_context() call */
Index: linux/drivers/misc/sgi-gru/grufault.c
===================================================================
--- linux.orig/drivers/misc/sgi-gru/grufault.c 2010-06-09 08:11:39.747460083 -0500
+++ linux/drivers/misc/sgi-gru/grufault.c 2010-06-09 08:11:40.285085853 -0500
@@ -289,8 +289,10 @@ static int gru_vtop(struct gru_thread_st
return VTOP_SUCCESS;

inval:
+ STAT(tlb_dropin_fail_invalid);
return VTOP_INVALID;
upm:
+ STAT(tlb_dropin_fail_retry);
return VTOP_RETRY;
}

@@ -422,7 +424,7 @@ static int gru_try_dropin(struct gru_sta
if (ret == VTOP_INVALID)
goto failinval;
if (ret == VTOP_RETRY)
- goto failupm;
+ goto failretry;

if (!(gts->ts_sizeavail & GRU_SIZEAVAIL(pageshift))) {
gts->ts_sizeavail |= GRU_SIZEAVAIL(pageshift);
@@ -438,9 +440,9 @@ static int gru_try_dropin(struct gru_sta
}

gru_cb_set_istatus_active(cbk);
- gts->ustats.tlbdropin++;
tfh_write_restart(tfh, gpa, GAA_RAM, vaddr, asid, write,
GRU_PAGESIZE(pageshift));
+ gts->ustats.tlbdropin++;
gru_dbg(grudev,
"%s: gid %d, gts 0x%p, tfh 0x%p, vaddr 0x%lx, asid 0x%x, indexway 0x%x,"
" rw %d, ps %d, gpa 0x%lx\n",
@@ -453,20 +455,33 @@ failnoasid:
/* No asid (delayed unload). */
STAT(tlb_dropin_fail_no_asid);
gru_dbg(grudev, "FAILED no_asid tfh: 0x%p, vaddr 0x%lx\n", tfh, vaddr);
- if (!cbk)
+ if (atomic)
tfh_user_polling_mode(tfh);
else
gru_flush_cache(tfh);
gru_flush_cache_cbe(cbe);
return -EAGAIN;

+failretry:
+ /* vtop failed - retry */
+ if (atomic)
+ tfh_user_polling_mode(tfh);
+ else
+ gru_flush_cache(tfh);
+ gru_flush_cache_cbe(cbe);
+ gru_dbg(grudev, "FAILED retry tfh: 0x%p, vaddr 0x%lx\n", tfh, vaddr);
+ return -EAGAIN;
+
failupm:
/* Atomic failure switch CBR to UPM */
- tfh_user_polling_mode(tfh);
+ if (atomic)
+ tfh_user_polling_mode(tfh);
+ else
+ gru_flush_cache(tfh);
gru_flush_cache_cbe(cbe);
STAT(tlb_dropin_fail_upm);
gru_dbg(grudev, "FAILED upm tfh: 0x%p, vaddr 0x%lx\n", tfh, vaddr);
- return 1;
+ return -EAGAIN;

failfmm:
/* FMM state on UPM call */
@@ -501,13 +516,12 @@ failinval:
/* All errors (atomic & non-atomic) switch CBR to EXCEPTION state */
tfh_exception(tfh);
gru_flush_cache_cbe(cbe);
- STAT(tlb_dropin_fail_invalid);
gru_dbg(grudev, "FAILED inval tfh: 0x%p, vaddr 0x%lx\n", tfh, vaddr);
return -EFAULT;

failactive:
/* Range invalidate active. Switch to UPM iff atomic */
- if (!cbk)
+ if (atomic)
tfh_user_polling_mode(tfh);
else
gru_flush_cache(tfh);
@@ -531,7 +545,7 @@ static irqreturn_t gru_intr(int chiplet,
struct gru_thread_state *gts;
struct gru_tlb_fault_handle *tfh = NULL;
struct completion *cmp;
- int cbrnum, ctxnum;
+ int cbrnum, ctxnum, multi = 0;

STAT(intr);

@@ -581,7 +595,10 @@ static irqreturn_t gru_intr(int chiplet,
* This is running in interrupt context. Trylock the mmap_sem.
* If it fails, retry the fault in user context.
*/
+ if (!multi)
+ gts->ustats.interrupts++;
gts->ustats.fmm_tlbmiss++;
+ multi = 1;
if (!gts->ts_force_cch_reload &&
down_read_trylock(&gts->ts_mm->mmap_sem)) {
gru_try_dropin(gru, gts, tfh, NULL);
Index: linux/drivers/misc/sgi-gru/gruprocfs.c
===================================================================
--- linux.orig/drivers/misc/sgi-gru/gruprocfs.c 2010-06-09 08:11:39.763413322 -0500
+++ linux/drivers/misc/sgi-gru/gruprocfs.c 2010-06-09 08:11:40.301082823 -0500
@@ -79,6 +79,7 @@ static int statistics_show(struct seq_fi
printstat(s, tlb_dropin);
printstat(s, tlb_preload_page);
printstat(s, tlb_dropin_fail_no_asid);
+ printstat(s, tlb_dropin_fail_retry);
printstat(s, tlb_dropin_fail_upm);
printstat(s, tlb_dropin_fail_invalid);
printstat(s, tlb_dropin_fail_range_active);
Index: linux/drivers/misc/sgi-gru/grutables.h
===================================================================
--- linux.orig/drivers/misc/sgi-gru/grutables.h 2010-06-09 08:11:39.779413278 -0500
+++ linux/drivers/misc/sgi-gru/grutables.h 2010-06-09 08:11:40.315537614 -0500
@@ -205,6 +205,7 @@ struct gru_stats_s {
atomic_long_t tlb_dropin;
atomic_long_t tlb_preload_page;
atomic_long_t tlb_dropin_fail_no_asid;
+ atomic_long_t tlb_dropin_fail_retry;
atomic_long_t tlb_dropin_fail_upm;
atomic_long_t tlb_dropin_fail_invalid;
atomic_long_t tlb_dropin_fail_range_active;


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