ntb_perf: Schedule based on time not on performance

When debugging performance problems, if some issue causes the ntb
hardware to be significantly slower than expected, ntb_perf will
hang requiring a reboot because it only schedules once every 4GB.

Instead, schedule based on jiffies so it will not hang the CPU if
the transfer is slow.

Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Acked-by: Dave Jiang <dave.jiang@intel.com>
Signed-off-by: Jon Mason <jdmason@kudzu.us>

diff --git a/drivers/ntb/test/ntb_perf.c b/drivers/ntb/test/ntb_perf.c
index 4368519..5008ccf 100644 (file)
--- a/drivers/ntb/test/ntb_perf.c
+++ b/drivers/ntb/test/ntb_perf.c
@@ -273,6 +273,7 @@ static int perf_move_data(struct pthr_ctx *pctx, char __iomem *dst, char *src,
        char __iomem *tmp = dst;
        u64 perf, diff_us;
        ktime_t kstart, kstop, kdiff;
+       unsigned long last_sleep = jiffies;
 
        chunks = div64_u64(win_size, buf_size);
        total_chunks = div64_u64(total, buf_size);
@@ -288,8 +289,9 @@ static int perf_move_data(struct pthr_ctx *pctx, char __iomem *dst, char *src,
                } else
                        tmp += buf_size;
 
-               /* Probably should schedule every 4GB to prevent soft hang. */
-               if (((copied % SZ_4G) == 0) && !use_dma) {
+               /* Probably should schedule every 5s to prevent soft hang. */
+               if (unlikely((jiffies - last_sleep) > 5 * HZ)) {
+                       last_sleep = jiffies;
                        set_current_state(TASK_INTERRUPTIBLE);
                        schedule_timeout(1);
                }