diff options
author | Liang Zhen <liang.zhen@intel.com> | 2016-10-02 22:28:06 -0400 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-10-16 10:24:26 +0200 |
commit | 239fd5d41f9b24e06dc747f02dc108e9b8cffb28 (patch) | |
tree | 4aa7fd2735f9296659ace0eceb2379e200fddf28 /drivers/staging/lustre/lnet/libcfs/linux/linux-cpu.c | |
parent | d0d3caaed9e1babafb5a883e02e596740acba854 (diff) | |
download | op-kernel-dev-239fd5d41f9b24e06dc747f02dc108e9b8cffb28.zip op-kernel-dev-239fd5d41f9b24e06dc747f02dc108e9b8cffb28.tar.gz |
staging: lustre: libcfs: shortcut to create CPT from NUMA topology
If user wants to create CPT table that can match numa topology,
she has to query cpu & numa topology, then provide a pattern
string to describe the topology, this is inconvenient.
To improve it, this patch can support shortcut expression "N" or "n"
to create CPT table from NUMA & CPU topology
Signed-off-by: Liang Zhen <liang.zhen@intel.com>
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-6325
Reviewed-on: http://review.whamcloud.com/14049
Reviewed-by: Olaf Weber <olaf@sgi.com>
Reviewed-by: Bobi Jam <bobijam@hotmail.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>
Signed-off-by: James Simmons <jsimmons@infradead.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/staging/lustre/lnet/libcfs/linux/linux-cpu.c')
-rw-r--r-- | drivers/staging/lustre/lnet/libcfs/linux/linux-cpu.c | 48 |
1 files changed, 40 insertions, 8 deletions
diff --git a/drivers/staging/lustre/lnet/libcfs/linux/linux-cpu.c b/drivers/staging/lustre/lnet/libcfs/linux/linux-cpu.c index e8b1a61..464b279 100644 --- a/drivers/staging/lustre/lnet/libcfs/linux/linux-cpu.c +++ b/drivers/staging/lustre/lnet/libcfs/linux/linux-cpu.c @@ -55,6 +55,8 @@ MODULE_PARM_DESC(cpu_npartitions, "# of CPU partitions"); * i.e: "N 0[0,1] 1[2,3]" the first character 'N' means numbers in bracket * are NUMA node ID, number before bracket is CPU partition ID. * + * i.e: "N", shortcut expression to create CPT from NUMA & CPU topology + * * NB: If user specified cpu_pattern, cpu_npartitions will be ignored */ static char *cpu_pattern = ""; @@ -818,11 +820,14 @@ static struct cfs_cpt_table * cfs_cpt_table_create_pattern(char *pattern) { struct cfs_cpt_table *cptab; - char *str = pattern; + char *str; int node = 0; int high; - int ncpt; + int ncpt = 0; + int cpt; + int rc; int c; + int i; for (ncpt = 0;; ncpt++) { /* quick scan bracket */ str = strchr(str, '['); @@ -834,7 +839,20 @@ cfs_cpt_table_create_pattern(char *pattern) str = cfs_trimwhite(pattern); if (*str == 'n' || *str == 'N') { pattern = str + 1; - node = 1; + if (*pattern != '\0') { + node = 1; + } else { /* shortcut to create CPT from NUMA & CPU topology */ + node = -1; + ncpt = num_online_nodes(); + } + } + + if (!ncpt) { /* scanning bracket which is mark of partition */ + for (str = pattern;; str++, ncpt++) { + str = strchr(str, '['); + if (!str) + break; + } } if (ncpt == 0 || @@ -845,21 +863,35 @@ cfs_cpt_table_create_pattern(char *pattern) return NULL; } - high = node ? MAX_NUMNODES - 1 : nr_cpu_ids - 1; - cptab = cfs_cpt_table_alloc(ncpt); if (!cptab) { CERROR("Failed to allocate cpu partition table\n"); return NULL; } + if (node < 0) { /* shortcut to create CPT from NUMA & CPU topology */ + cpt = 0; + + for_each_online_node(i) { + if (cpt >= ncpt) { + CERROR("CPU changed while setting CPU partition table, %d/%d\n", + cpt, ncpt); + goto failed; + } + + rc = cfs_cpt_set_node(cptab, cpt++, i); + if (!rc) + goto failed; + } + return cptab; + } + + high = node ? MAX_NUMNODES - 1 : nr_cpu_ids - 1; + for (str = cfs_trimwhite(pattern), c = 0;; c++) { struct cfs_range_expr *range; struct cfs_expr_list *el; char *bracket = strchr(str, '['); - int cpt; - int rc; - int i; int n; if (!bracket) { |