[lustre-devel] [PATCH v3 10/26] staging: lustre: libcfs: provide debugfs files for distance handling
James Simmons
jsimmons at infradead.org
Sun Jun 24 14:20:34 PDT 2018
From: Amir Shehata <amir.shehata at intel.com>
On systems with large number of NUMA nodes and cores it is easy
to incorrectly configure their use with Lustre. Provide debugfs
files which can help track down any issues.
Signed-off-by: Amir Shehata <amir.shehata at intel.com>
WC-bug-id: https://jira.whamcloud.com/browse/LU-7734
Reviewed-on: http://review.whamcloud.com/18916
Reviewed-by: Olaf Weber <olaf at sgi.com>
Reviewed-by: Doug Oucharek <dougso at me.com>
Signed-off-by: James Simmons <jsimmons at infradead.org>
---
drivers/staging/lustre/lnet/libcfs/module.c | 48 +++++++++++++++++++++++++++++
1 file changed, 48 insertions(+)
diff --git a/drivers/staging/lustre/lnet/libcfs/module.c b/drivers/staging/lustre/lnet/libcfs/module.c
index 02c404c..2281f08 100644
--- a/drivers/staging/lustre/lnet/libcfs/module.c
+++ b/drivers/staging/lustre/lnet/libcfs/module.c
@@ -425,6 +425,48 @@ static int proc_cpt_table(struct ctl_table *table, int write,
return rc;
}
+static int proc_cpt_distance(struct ctl_table *table, int write,
+ void __user *buffer, size_t *lenp, loff_t *ppos)
+{
+ size_t nob = *lenp;
+ loff_t pos = *ppos;
+ char *buf = NULL;
+ int len = 4096;
+ int rc = 0;
+
+ if (write)
+ return -EPERM;
+
+ LASSERT(cfs_cpt_tab);
+
+ while (1) {
+ buf = kzalloc(len, GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
+
+ rc = cfs_cpt_distance_print(cfs_cpt_tab, buf, len);
+ if (rc >= 0)
+ break;
+
+ if (rc == -EFBIG) {
+ kfree(buf);
+ len <<= 1;
+ continue;
+ }
+ goto out;
+ }
+
+ if (pos >= rc) {
+ rc = 0;
+ goto out;
+ }
+
+ rc = cfs_trace_copyout_string(buffer, nob, buf + pos, NULL);
+out:
+ kfree(buf);
+ return rc;
+}
+
static struct ctl_table lnet_table[] = {
{
.procname = "debug",
@@ -454,6 +496,12 @@ static int proc_cpt_table(struct ctl_table *table, int write,
.proc_handler = &proc_cpt_table,
},
{
+ .procname = "cpu_partition_distance",
+ .maxlen = 128,
+ .mode = 0444,
+ .proc_handler = &proc_cpt_distance,
+ },
+ {
.procname = "debug_log_upcall",
.data = lnet_debug_log_upcall,
.maxlen = sizeof(lnet_debug_log_upcall),
--
1.8.3.1
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