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* [ndctl PATCH] ndctl/namespace: Fix 'clear-error -s' excessive scrubbing
@ 2019-08-27 18:58 Dan Williams
  2019-08-27 19:42 ` Verma, Vishal L
  0 siblings, 1 reply; 2+ messages in thread
From: Dan Williams @ 2019-08-27 18:58 UTC (permalink / raw)
  To: vishal.l.verma; +Cc: Erwin Tsaur, linux-nvdimm

Erwin reports:
    The current implementation of ndctl clear-errors takes a very long time,
    because a full scrub happens for every namespace.

    Doing a full system ARS scrub is obviously not necessary, it just needs
    to happen once.

Indeed, it only needs to happen once per bus. Clear the 'scrub' option
after one namespace_clear_bb() invocation, and reset it when looping to
the next bus.

Link: https://github.com/pmem/ndctl/issues/104
Reported-by: Erwin Tsaur <erwin.tsaur@oracle.com>
Fixes: 2ba7b8277075 ("ndctl: add a 'clear-errors' command")
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
---
 ndctl/namespace.c |   18 +++++++++++++-----
 1 file changed, 13 insertions(+), 5 deletions(-)

diff --git a/ndctl/namespace.c b/ndctl/namespace.c
index bbc9107c6baa..c1af7d0db153 100644
--- a/ndctl/namespace.c
+++ b/ndctl/namespace.c
@@ -1295,7 +1295,7 @@ static int raw_clear_badblocks(struct ndctl_namespace *ndns)
 	return nstype_clear_badblocks(ndns, devname, begin, size);
 }
 
-static int namespace_wait_scrub(struct ndctl_namespace *ndns)
+static int namespace_wait_scrub(struct ndctl_namespace *ndns, bool do_scrub)
 {
 	const char *devname = ndctl_namespace_get_devname(ndns);
 	struct ndctl_bus *bus = ndctl_namespace_get_bus(ndns);
@@ -1309,7 +1309,7 @@ static int namespace_wait_scrub(struct ndctl_namespace *ndns)
 	}
 
 	/* start a scrub if asked and if one isn't in progress */
-	if (scrub && (!in_progress)) {
+	if (do_scrub && (!in_progress)) {
 		rc = ndctl_bus_start_scrub(bus);
 		if (rc) {
 			error("%s: Unable to start scrub: %s\n", devname,
@@ -1332,7 +1332,7 @@ static int namespace_wait_scrub(struct ndctl_namespace *ndns)
 	return 0;
 }
 
-static int namespace_clear_bb(struct ndctl_namespace *ndns)
+static int namespace_clear_bb(struct ndctl_namespace *ndns, bool do_scrub)
 {
 	struct ndctl_pfn *pfn = ndctl_namespace_get_pfn(ndns);
 	struct ndctl_dax *dax = ndctl_namespace_get_dax(ndns);
@@ -1347,7 +1347,7 @@ static int namespace_clear_bb(struct ndctl_namespace *ndns)
 		return 1;
 	}
 
-	rc = namespace_wait_scrub(ndns);
+	rc = namespace_wait_scrub(ndns, do_scrub);
 	if (rc)
 		return rc;
 
@@ -1716,9 +1716,14 @@ static int do_xaction_namespace(const char *namespace,
 		ndctl_set_log_priority(ctx, LOG_DEBUG);
 
         ndctl_bus_foreach(ctx, bus) {
+		bool do_scrub;
+
 		if (!util_bus_filter(bus, param.bus))
 			continue;
 
+		/* only request scrubbing once per bus */
+		do_scrub = scrub;
+
 		ndctl_region_foreach(bus, region) {
 			if (!util_region_filter(region, param.region))
 				continue;
@@ -1778,7 +1783,10 @@ static int do_xaction_namespace(const char *namespace,
 						(*processed)++;
 					break;
 				case ACTION_CLEAR:
-					rc = namespace_clear_bb(ndns);
+					rc = namespace_clear_bb(ndns, do_scrub);
+
+					/* one scrub per bus is sufficient */
+					do_scrub = false;
 					if (rc == 0)
 						(*processed)++;
 					break;

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2019-08-27 18:58 [ndctl PATCH] ndctl/namespace: Fix 'clear-error -s' excessive scrubbing Dan Williams
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