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Subject[Patch 28/29] GRU - improve GRU TLB dropin statistics
From: Jack Steiner <steiner@sgi.com>

Update the TLB dropin statistics kept for each GRU context. Count
TLB dropins separate from the misses - some misses do not result
in a TLB dropin. Some of the diagnostics need both counts.

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

---
drivers/misc/sgi-gru/gru.h | 11 +++++++++++
drivers/misc/sgi-gru/grufault.c | 5 +++--
drivers/misc/sgi-gru/grulib.h | 13 ++-----------
drivers/misc/sgi-gru/grutables.h | 2 +-
4 files changed, 17 insertions(+), 14 deletions(-)
Index: linux/drivers/misc/sgi-gru/gru.h
===================================================================
--- linux.orig/drivers/misc/sgi-gru/gru.h 2009-11-20 09:32:13.000000000 -0600
+++ linux/drivers/misc/sgi-gru/gru.h 2009-11-20 09:32:39.000000000 -0600
@@ -53,6 +53,17 @@ struct gru_chiplet_info {
int free_user_cbr;
};

+/*
+ * Statictics kept for each context.
+ */
+struct gru_gseg_statistics {
+ unsigned long fmm_tlbmiss;
+ unsigned long upm_tlbmiss;
+ unsigned long tlbdropin;
+ unsigned long context_stolen;
+ unsigned long reserved[10];
+};
+
/* Flags for GRU options on the gru_create_context() call */
/* Select one of the follow 4 options to specify how TLB misses are handled */
#define GRU_OPT_MISS_DEFAULT 0x0000 /* Use default mode */
Index: linux/drivers/misc/sgi-gru/grufault.c
===================================================================
--- linux.orig/drivers/misc/sgi-gru/grufault.c 2009-11-20 09:32:38.000000000 -0600
+++ linux/drivers/misc/sgi-gru/grufault.c 2009-11-20 09:32:39.000000000 -0600
@@ -438,6 +438,7 @@ 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));
gru_dbg(grudev,
@@ -580,9 +581,9 @@ 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.
*/
+ gts->ustats.fmm_tlbmiss++;
if (!gts->ts_force_cch_reload &&
down_read_trylock(&gts->ts_mm->mmap_sem)) {
- gts->ustats.fmm_tlbdropin++;
gru_try_dropin(gru, gts, tfh, NULL);
up_read(&gts->ts_mm->mmap_sem);
} else {
@@ -624,7 +625,7 @@ static int gru_user_dropin(struct gru_th
struct gru_mm_struct *gms = gts->ts_gms;
int ret;

- gts->ustats.upm_tlbdropin++;
+ gts->ustats.upm_tlbmiss++;
while (1) {
wait_event(gms->ms_wait_queue,
atomic_read(&gms->ms_range_active) == 0);
Index: linux/drivers/misc/sgi-gru/grulib.h
===================================================================
--- linux.orig/drivers/misc/sgi-gru/grulib.h 2009-11-20 09:32:35.000000000 -0600
+++ linux/drivers/misc/sgi-gru/grulib.h 2009-11-20 09:32:39.000000000 -0600
@@ -63,18 +63,9 @@
#define THREAD_POINTER(p, th) (p + GRU_GSEG_PAGESIZE * (th))
#define GSEG_START(cb) ((void *)((unsigned long)(cb) & ~(GRU_GSEG_PAGESIZE - 1)))

-/*
- * Statictics kept on a per-GTS basis.
- */
-struct gts_statistics {
- unsigned long fmm_tlbdropin;
- unsigned long upm_tlbdropin;
- unsigned long context_stolen;
-};
-
struct gru_get_gseg_statistics_req {
- unsigned long gseg;
- struct gts_statistics stats;
+ unsigned long gseg;
+ struct gru_gseg_statistics stats;
};

/*
Index: linux/drivers/misc/sgi-gru/grutables.h
===================================================================
--- linux.orig/drivers/misc/sgi-gru/grutables.h 2009-11-20 09:32:38.000000000 -0600
+++ linux/drivers/misc/sgi-gru/grutables.h 2009-11-20 09:32:39.000000000 -0600
@@ -385,7 +385,7 @@ struct gru_thread_state {
allocated CB */
int ts_data_valid; /* Indicates if ts_gdata has
valid data */
- struct gts_statistics ustats; /* User statistics */
+ struct gru_gseg_statistics ustats; /* User statistics */
unsigned long ts_gdata[0]; /* save area for GRU data (CB,
DS, CBE) */
};


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