From: Liang Zhen <liang.z...@intel.com> 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.z...@intel.com> Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-6325 Reviewed-on: http://review.whamcloud.com/14049 Reviewed-by: Olaf Weber <o...@sgi.com> Reviewed-by: Bobi Jam <bobi...@hotmail.com> Reviewed-by: Oleg Drokin <oleg.dro...@intel.com> Signed-off-by: James Simmons <jsimm...@infradead.org> --- .../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) { -- 1.7.1 _______________________________________________ devel mailing list de...@linuxdriverproject.org http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel
