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authorLogan Gunthorpe <logang@deltatee.com>2016-06-20 13:15:04 -0600
committerJon Mason <jdmason@kudzu.us>2016-08-05 10:21:06 -0400
commitfd2ecd885bab8e456298d0b702806ea736456c62 (patch)
tree705a3ba20eba4662738fbc94e25a818ab4942783
parent19645a077120c6417e9dc5ad469c45194cf78a82 (diff)
downloadlinux-fd2ecd885bab8e456298d0b702806ea736456c62.tar.bz2
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>
-rw-r--r--drivers/ntb/test/ntb_perf.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/ntb/test/ntb_perf.c b/drivers/ntb/test/ntb_perf.c
index 4368519da102..5008ccf600a9 100644
--- 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);
}