Re: [PATCH 5/7] genirq/affinity: move group_cpus_evenly() into lib/
From: kernel test robot
Date: Mon Aug 16 2021 - 06:08:27 EST
Hi Ming,
Thank you for the patch! Perhaps something to improve:
[auto build test WARNING on tip/irq/core]
[also build test WARNING on next-20210813]
[cannot apply to block/for-next linux/master linus/master v5.14-rc5]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]
url:
https://github.com/0day-ci/linux/commits/Ming-Lei/genirq-affinity-abstract-new-API-from-managed-irq-affinity-spread/20210814-203741
base: https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git
04c2721d3530f0723b4c922a8fa9f26b202a20de
config: x86_64-randconfig-c001-20210814 (attached as .config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project
1f7b25ea76a925aca690da28de9d78db7ca99d0c)
reproduce (this is a W=1 build):
wget
https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross
-O ~/bin/make.cross
chmod +x ~/bin/make.cross
# install x86_64 cross compiling tool for clang build
# apt-get install binutils-x86-64-linux-gnu
#
https://github.com/0day-ci/linux/commit/759f72186bfdd5c3ba8b53ac0749cf7ba930012c
git remote add linux-review https://github.com/0day-ci/linux
git fetch --no-tags linux-review
Ming-Lei/genirq-affinity-abstract-new-API-from-managed-irq-affinity-spread/20210814-203741
git checkout 759f72186bfdd5c3ba8b53ac0749cf7ba930012c
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross
ARCH=x86_64 clang-analyzer
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>
clang-analyzer warnings: (new ones prefixed by >>)
6 warnings generated.
Suppressed 6 warnings (6 in non-user code).
Use -header-filter=.* to display errors from all non-system headers.
Use -system-headers to display errors from system headers as well.
6 warnings generated.
Suppressed 6 warnings (6 in non-user code).
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Use -system-headers to display errors from system headers as well.
6 warnings generated.
Suppressed 6 warnings (6 in non-user code).
Use -header-filter=.* to display errors from all non-system headers.
Use -system-headers to display errors from system headers as well.
6 warnings generated.
Suppressed 6 warnings (6 in non-user code).
Use -header-filter=.* to display errors from all non-system headers.
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6 warnings generated.
Suppressed 6 warnings (6 in non-user code).
Use -header-filter=.* to display errors from all non-system headers.
Use -system-headers to display errors from system headers as well.
6 warnings generated.
Suppressed 6 warnings (6 in non-user code).
Use -header-filter=.* to display errors from all non-system headers.
Use -system-headers to display errors from system headers as well.
6 warnings generated.
Suppressed 6 warnings (6 in non-user code).
Use -header-filter=.* to display errors from all non-system headers.
Use -system-headers to display errors from system headers as well.
6 warnings generated.
Suppressed 6 warnings (6 in non-user code).
Use -header-filter=.* to display errors from all non-system headers.
Use -system-headers to display errors from system headers as well.
6 warnings generated.
Suppressed 6 warnings (6 in non-user code).
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Use -system-headers to display errors from system headers as well.
6 warnings generated.
Suppressed 6 warnings (6 in non-user code).
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Use -system-headers to display errors from system headers as well.
6 warnings generated.
Suppressed 6 warnings (6 in non-user code).
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Use -system-headers to display errors from system headers as well.
7 warnings generated.
Suppressed 7 warnings (6 in non-user code, 1 with check filters).
Use -header-filter=.* to display errors from all non-system headers.
Use -system-headers to display errors from system headers as well.
5 warnings generated.
Suppressed 5 warnings (5 in non-user code).
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Use -system-headers to display errors from system headers as well.
5 warnings generated.
Suppressed 5 warnings (5 in non-user code).
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Use -system-headers to display errors from system headers as well.
5 warnings generated.
Suppressed 5 warnings (5 in non-user code).
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Use -system-headers to display errors from system headers as well.
5 warnings generated.
Suppressed 5 warnings (5 in non-user code).
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Use -system-headers to display errors from system headers as well.
3 warnings generated.
Suppressed 3 warnings (3 in non-user code).
Use -header-filter=.* to display errors from all non-system headers.
Use -system-headers to display errors from system headers as well.
7 warnings generated.
lib/glob.c:48:32: warning: Assigned value is garbage or undefined
[clang-analyzer-core.uninitialized.Assign]
char const *back_pat = NULL, *back_str = back_str;
^ ~~~~~~~~
lib/glob.c:48:32: note: Assigned value is garbage or undefined
char const *back_pat = NULL, *back_str = back_str;
^ ~~~~~~~~
Suppressed 6 warnings (6 in non-user code).
Use -header-filter=.* to display errors from all non-system headers.
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6 warnings generated.
Suppressed 6 warnings (6 in non-user code).
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Use -system-headers to display errors from system headers as well.
6 warnings generated.
Suppressed 6 warnings (6 in non-user code).
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Use -system-headers to display errors from system headers as well.
7 warnings generated.
lib/strnlen_user.c:34:2: warning: Value stored to 'src' is never
read [clang-analyzer-deadcode.DeadStores]
src -= align;
^ ~~~~~
lib/strnlen_user.c:34:2: note: Value stored to 'src' is never read
src -= align;
^ ~~~~~
Suppressed 6 warnings (6 in non-user code).
Use -header-filter=.* to display errors from all non-system headers.
Use -system-headers to display errors from system headers as well.
7 warnings generated.
Suppressed 7 warnings (7 in non-user code).
Use -header-filter=.* to display errors from all non-system headers.
Use -system-headers to display errors from system headers as well.
7 warnings generated.
Suppressed 7 warnings (7 in non-user code).
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Use -system-headers to display errors from system headers as well.
6 warnings generated.
Suppressed 6 warnings (6 in non-user code).
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Use -system-headers to display errors from system headers as well.
6 warnings generated.
Suppressed 6 warnings (6 in non-user code).
Use -header-filter=.* to display errors from all non-system headers.
Use -system-headers to display errors from system headers as well.
7 warnings generated.
lib/oid_registry.c:149:3: warning: Value stored to 'num' is never
read [clang-analyzer-deadcode.DeadStores]
num = 0;
^ ~
lib/oid_registry.c:149:3: note: Value stored to 'num' is never read
num = 0;
^ ~
Suppressed 6 warnings (6 in non-user code).
Use -header-filter=.* to display errors from all non-system headers.
Use -system-headers to display errors from system headers as well.
9 warnings generated.
Suppressed 9 warnings (2 in non-user code, 7 with check filters).
Use -header-filter=.* to display errors from all non-system headers.
Use -system-headers to display errors from system headers as well.
7 warnings generated.
lib/group_cpus.c:236:22: warning: Division by zero [clang-analyzer-core.DivideZero]
numgrps * ncpus / remaining_ncpus);
^
lib/group_cpus.c:352:2: note: Taking false branch
if (!zalloc_cpumask_var(&nmsk, GFP_KERNEL))
^
lib/group_cpus.c:355:2: note: Taking false branch
if (!zalloc_cpumask_var(&npresmsk, GFP_KERNEL))
^
lib/group_cpus.c:359:7: note: 'node_to_cpumask' is non-null
if (!node_to_cpumask)
^~~~~~~~~~~~~~~
lib/group_cpus.c:359:2: note: Taking false branch
if (!node_to_cpumask)
^
lib/group_cpus.c:363:6: note: Assuming 'masks' is non-null
if (!masks)
^~~~~~
lib/group_cpus.c:363:2: note: Taking false branch
if (!masks)
^
lib/group_cpus.c:371:8: note: Calling '__group_cpus_evenly'
ret = __group_cpus_evenly(curgrp, numgrps, node_to_cpumask,
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
lib/group_cpus.c:257:6: note: Assuming the condition is false
if (!cpumask_weight(cpu_mask))
^~~~~~~~~~~~~~~~~~~~~~~~~
lib/group_cpus.c:257:2: note: Taking false branch
if (!cpumask_weight(cpu_mask))
^
lib/group_cpus.c:266:6: note: Assuming 'numgrps' is > 'nodes'
if (numgrps <= nodes) {
^~~~~~~~~~~~~~~~
lib/group_cpus.c:266:2: note: Taking false branch
if (numgrps <= nodes) {
^
lib/group_cpus.c:279:6: note: Assuming 'node_groups' is non-null
if (!node_groups)
^~~~~~~~~~~~
lib/group_cpus.c:279:2: note: Taking false branch
if (!node_groups)
^
lib/group_cpus.c:283:2: note: Calling 'alloc_nodes_groups'
alloc_nodes_groups(numgrps, node_to_cpumask, cpu_mask,
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
lib/group_cpus.c:134:14: note: 'remaining_ncpus' initialized to 0
unsigned n, remaining_ncpus = 0;
^~~~~~~~~~~~~~~
lib/group_cpus.c:136:2: note: Loop condition is true. Entering loop
body
for (n = 0; n < nr_node_ids; n++) {
^
lib/group_cpus.c:136:2: note: Loop condition is false. Execution
continues on line 141
lib/group_cpus.c:141:2: note: Taking false branch
for_each_node_mask(n, nodemsk) {
^
include/linux/nodemask.h:384:2: note: expanded from macro
'for_each_node_mask'
if (!nodes_empty(mask)) \
^
lib/group_cpus.c:153:12: note: '__UNIQUE_ID___x401' is <
'__UNIQUE_ID___y402'
numgrps = min_t(unsigned, remaining_ncpus, numgrps);
^
include/linux/minmax.h:104:27: note: expanded from macro 'min_t'
#define min_t(type, x, y) __careful_cmp((type)(x), (type)(y), <)
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/minmax.h:38:3: note: expanded from macro '__careful_cmp'
__cmp_once(x, y, __UNIQUE_ID(__x), __UNIQUE_ID(__y),
op))
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/minmax.h:33:3: note: expanded from macro '__cmp_once'
__cmp(unique_x, unique_y, op); })
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/minmax.h:28:26: note: expanded from macro '__cmp'
#define __cmp(x, y, op) ((x) op (y) ? (x) : (y))
^~~
lib/group_cpus.c:153:12: note: '?' condition is true
numgrps = min_t(unsigned, remaining_ncpus, numgrps);
^
include/linux/minmax.h:104:27: note: expanded from macro 'min_t'
#define min_t(type, x, y) __careful_cmp((type)(x), (type)(y), <)
^
include/linux/minmax.h:38:3: note: expanded from macro '__careful_cmp'
__cmp_once(x, y, __UNIQUE_ID(__x), __UNIQUE_ID(__y),
op))
^
include/linux/minmax.h:33:3: note: expanded from macro '__cmp_once'
__cmp(unique_x, unique_y, op); })
^
include/linux/minmax.h:28:26: note: expanded from macro '__cmp'
#define __cmp(x, y, op) ((x) op (y) ? (x) : (y))
^
lib/group_cpus.c:226:2: note: Loop condition is true. Entering loop
body
for (n = 0; n < nr_node_ids; n++) {
^
lib/group_cpus.c:229:7: note: Assuming the condition is false
if (node_groups[n].ncpus == UINT_MAX)
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
lib/group_cpus.c:229:3: note: Taking false branch
if (node_groups[n].ncpus == UINT_MAX)
^
lib/group_cpus.c:232:3: note: Taking true branch
WARN_ON_ONCE(numgrps == 0);
^
include/asm-generic/bug.h:105:2: note: expanded from macro
'WARN_ON_ONCE'
vim +236 lib/group_cpus.c
759f72186bfdd5 Ming Lei 2021-08-14 113 759f72186bfdd5 Ming Lei
2021-08-14 114 /*
759f72186bfdd5 Ming Lei 2021-08-14 115 * Allocate group number for
each node, so that for each node:
759f72186bfdd5 Ming Lei 2021-08-14 116 *
759f72186bfdd5 Ming Lei 2021-08-14 117 * 1) the allocated number is >= 1
759f72186bfdd5 Ming Lei 2021-08-14 118 *
759f72186bfdd5 Ming Lei 2021-08-14 119 * 2) the allocated number is
<= active CPU number of this node
759f72186bfdd5 Ming Lei 2021-08-14 120 *
759f72186bfdd5 Ming Lei 2021-08-14 121 * The actual allocated total
groups may be less than @numgrps when
759f72186bfdd5 Ming Lei 2021-08-14 122 * active total CPU number is
less than @numgrps.
759f72186bfdd5 Ming Lei 2021-08-14 123 *
759f72186bfdd5 Ming Lei 2021-08-14 124 * Active CPUs means the CPUs
in '@cpu_mask AND @node_to_cpumask[]'
759f72186bfdd5 Ming Lei 2021-08-14 125 * for each node.
759f72186bfdd5 Ming Lei 2021-08-14 126 */
759f72186bfdd5 Ming Lei 2021-08-14 127 static void
alloc_nodes_groups(unsigned int numgrps,
759f72186bfdd5 Ming Lei 2021-08-14 128 cpumask_var_t
*node_to_cpumask,
759f72186bfdd5 Ming Lei 2021-08-14 129 const struct cpumask
*cpu_mask,
759f72186bfdd5 Ming Lei 2021-08-14 130 const nodemask_t nodemsk,
759f72186bfdd5 Ming Lei 2021-08-14 131 struct cpumask *nmsk,
759f72186bfdd5 Ming Lei 2021-08-14 132 struct node_groups
*node_groups)
759f72186bfdd5 Ming Lei 2021-08-14 133 {
759f72186bfdd5 Ming Lei 2021-08-14 134 unsigned n, remaining_ncpus = 0;
759f72186bfdd5 Ming Lei 2021-08-14 135 759f72186bfdd5 Ming Lei
2021-08-14 136 for (n = 0; n < nr_node_ids; n++) {
759f72186bfdd5 Ming Lei 2021-08-14 137 node_groups[n].id = n;
759f72186bfdd5 Ming Lei 2021-08-14 138 node_groups[n].ncpus = UINT_MAX;
759f72186bfdd5 Ming Lei 2021-08-14 139 }
759f72186bfdd5 Ming Lei 2021-08-14 140 759f72186bfdd5 Ming Lei
2021-08-14 141 for_each_node_mask(n, nodemsk) {
759f72186bfdd5 Ming Lei 2021-08-14 142 unsigned ncpus;
759f72186bfdd5 Ming Lei 2021-08-14 143 759f72186bfdd5 Ming Lei
2021-08-14 144 cpumask_and(nmsk, cpu_mask, node_to_cpumask[n]);
759f72186bfdd5 Ming Lei 2021-08-14 145 ncpus = cpumask_weight(nmsk);
759f72186bfdd5 Ming Lei 2021-08-14 146 759f72186bfdd5 Ming Lei
2021-08-14 147 if (!ncpus)
759f72186bfdd5 Ming Lei 2021-08-14 148 continue;
759f72186bfdd5 Ming Lei 2021-08-14 149 remaining_ncpus += ncpus;
759f72186bfdd5 Ming Lei 2021-08-14 150 node_groups[n].ncpus = ncpus;
759f72186bfdd5 Ming Lei 2021-08-14 151 }
759f72186bfdd5 Ming Lei 2021-08-14 152 759f72186bfdd5 Ming Lei
2021-08-14 153 numgrps = min_t(unsigned, remaining_ncpus, numgrps);
759f72186bfdd5 Ming Lei 2021-08-14 154 759f72186bfdd5 Ming Lei
2021-08-14 155 sort(node_groups, nr_node_ids, sizeof(node_groups[0]),
759f72186bfdd5 Ming Lei 2021-08-14 156 ncpus_cmp_func, NULL);
759f72186bfdd5 Ming Lei 2021-08-14 157 759f72186bfdd5 Ming Lei
2021-08-14 158 /*
759f72186bfdd5 Ming Lei 2021-08-14 159 * Allocate groups for each
node according to the ratio of this
759f72186bfdd5 Ming Lei 2021-08-14 160 * node's nr_cpus to remaining
un-assigned ncpus. 'numgrps' is
759f72186bfdd5 Ming Lei 2021-08-14 161 * bigger than number of
active numa nodes. Always start the
759f72186bfdd5 Ming Lei 2021-08-14 162 * allocation from the node
with minimized nr_cpus.
759f72186bfdd5 Ming Lei 2021-08-14 163 *
759f72186bfdd5 Ming Lei 2021-08-14 164 * This way guarantees that
each active node gets allocated at
759f72186bfdd5 Ming Lei 2021-08-14 165 * least one group, and the
theory is simple: over-allocation
759f72186bfdd5 Ming Lei 2021-08-14 166 * is only done when this node
is assigned by one group, so
759f72186bfdd5 Ming Lei 2021-08-14 167 * other nodes will be
allocated >= 1 groups, since 'numgrps' is
759f72186bfdd5 Ming Lei 2021-08-14 168 * bigger than number of numa
nodes.
759f72186bfdd5 Ming Lei 2021-08-14 169 *
759f72186bfdd5 Ming Lei 2021-08-14 170 * One perfect invariant is
that number of allocated groups for
759f72186bfdd5 Ming Lei 2021-08-14 171 * each node is <= CPU count
of this node:
759f72186bfdd5 Ming Lei 2021-08-14 172 *
759f72186bfdd5 Ming Lei 2021-08-14 173 * 1) suppose there are two
nodes: A and B
759f72186bfdd5 Ming Lei 2021-08-14 174 * ncpu(X) is CPU count of node X
759f72186bfdd5 Ming Lei 2021-08-14 175 * grps(X) is the group count
allocated to node X via this
759f72186bfdd5 Ming Lei 2021-08-14 176 * algorithm
759f72186bfdd5 Ming Lei 2021-08-14 177 *
759f72186bfdd5 Ming Lei 2021-08-14 178 * ncpu(A) <= ncpu(B)
759f72186bfdd5 Ming Lei 2021-08-14 179 * ncpu(A) + ncpu(B) = N
759f72186bfdd5 Ming Lei 2021-08-14 180 * grps(A) + grps(B) = G
759f72186bfdd5 Ming Lei 2021-08-14 181 *
759f72186bfdd5 Ming Lei 2021-08-14 182 * grps(A) = max(1,
round_down(G * ncpu(A) / N))
759f72186bfdd5 Ming Lei 2021-08-14 183 * grps(B) = G - grps(A)
759f72186bfdd5 Ming Lei 2021-08-14 184 *
759f72186bfdd5 Ming Lei 2021-08-14 185 * both N and G are integer,
and 2 <= G <= N, suppose
759f72186bfdd5 Ming Lei 2021-08-14 186 * G = N - delta, and 0 <=
delta <= N - 2
759f72186bfdd5 Ming Lei 2021-08-14 187 *
759f72186bfdd5 Ming Lei 2021-08-14 188 * 2) obviously grps(A) <=
ncpu(A) because:
759f72186bfdd5 Ming Lei 2021-08-14 189 *
759f72186bfdd5 Ming Lei 2021-08-14 190 * if grps(A) is 1, then
grps(A) <= ncpu(A) given
759f72186bfdd5 Ming Lei 2021-08-14 191 * ncpu(A) >= 1
759f72186bfdd5 Ming Lei 2021-08-14 192 *
759f72186bfdd5 Ming Lei 2021-08-14 193 * otherwise,
759f72186bfdd5 Ming Lei 2021-08-14 194 * grps(A) <= G * ncpu(A) /
N <= ncpu(A), given G <= N
759f72186bfdd5 Ming Lei 2021-08-14 195 *
759f72186bfdd5 Ming Lei 2021-08-14 196 * 3) prove how grps(B) <=
ncpu(B):
759f72186bfdd5 Ming Lei 2021-08-14 197 *
759f72186bfdd5 Ming Lei 2021-08-14 198 * if round_down(G * ncpu(A)
/ N) == 0, vecs(B) won't be
759f72186bfdd5 Ming Lei 2021-08-14 199 * over-allocated, so grps(B)
<= ncpu(B),
759f72186bfdd5 Ming Lei 2021-08-14 200 *
759f72186bfdd5 Ming Lei 2021-08-14 201 * otherwise:
759f72186bfdd5 Ming Lei 2021-08-14 202 *
759f72186bfdd5 Ming Lei 2021-08-14 203 * grps(A) =
759f72186bfdd5 Ming Lei 2021-08-14 204 * round_down(G * ncpu(A) / N) =
759f72186bfdd5 Ming Lei 2021-08-14 205 * round_down((N - delta) *
ncpu(A) / N) =
759f72186bfdd5 Ming Lei 2021-08-14 206 * round_down((N * ncpu(A) -
delta * ncpu(A)) / N) >=
759f72186bfdd5 Ming Lei 2021-08-14 207 * round_down((N * ncpu(A) -
delta * N) / N) =
759f72186bfdd5 Ming Lei 2021-08-14 208 * cpu(A) - delta
759f72186bfdd5 Ming Lei 2021-08-14 209 *
759f72186bfdd5 Ming Lei 2021-08-14 210 * then:
759f72186bfdd5 Ming Lei 2021-08-14 211 *
759f72186bfdd5 Ming Lei 2021-08-14 212 * grps(A) - G >= ncpu(A) -
delta - G
759f72186bfdd5 Ming Lei 2021-08-14 213 * =>
759f72186bfdd5 Ming Lei 2021-08-14 214 * G - grps(A) <= G + delta -
ncpu(A)
759f72186bfdd5 Ming Lei 2021-08-14 215 * =>
759f72186bfdd5 Ming Lei 2021-08-14 216 * grps(B) <= N - ncpu(A)
759f72186bfdd5 Ming Lei 2021-08-14 217 * =>
759f72186bfdd5 Ming Lei 2021-08-14 218 * grps(B) <= cpu(B)
759f72186bfdd5 Ming Lei 2021-08-14 219 *
759f72186bfdd5 Ming Lei 2021-08-14 220 * For nodes >= 3, it can be
thought as one node and another big
759f72186bfdd5 Ming Lei 2021-08-14 221 * node given that is exactly
what this algorithm is implemented,
759f72186bfdd5 Ming Lei 2021-08-14 222 * and we always re-calculate
'remaining_ncpus' & 'numgrps', and
759f72186bfdd5 Ming Lei 2021-08-14 223 * finally for each node X:
grps(X) <= ncpu(X).
759f72186bfdd5 Ming Lei 2021-08-14 224 *
759f72186bfdd5 Ming Lei 2021-08-14 225 */
759f72186bfdd5 Ming Lei 2021-08-14 226 for (n = 0; n < nr_node_ids;
n++) {
759f72186bfdd5 Ming Lei 2021-08-14 227 unsigned ngroups, ncpus;
759f72186bfdd5 Ming Lei 2021-08-14 228 759f72186bfdd5 Ming Lei
2021-08-14 229 if (node_groups[n].ncpus == UINT_MAX)
759f72186bfdd5 Ming Lei 2021-08-14 230 continue;
759f72186bfdd5 Ming Lei 2021-08-14 231 759f72186bfdd5 Ming Lei
2021-08-14 232 WARN_ON_ONCE(numgrps == 0);
759f72186bfdd5 Ming Lei 2021-08-14 233 759f72186bfdd5 Ming Lei
2021-08-14 234 ncpus = node_groups[n].ncpus;
759f72186bfdd5 Ming Lei 2021-08-14 235 ngroups = max_t(unsigned, 1,
759f72186bfdd5 Ming Lei 2021-08-14 @236 numgrps * ncpus /
remaining_ncpus);
759f72186bfdd5 Ming Lei 2021-08-14 237 WARN_ON_ONCE(ngroups > ncpus);
759f72186bfdd5 Ming Lei 2021-08-14 238 759f72186bfdd5 Ming Lei
2021-08-14 239 node_groups[n].ngroups = ngroups;
759f72186bfdd5 Ming Lei 2021-08-14 240 759f72186bfdd5 Ming Lei
2021-08-14 241 remaining_ncpus -= ncpus;
759f72186bfdd5 Ming Lei 2021-08-14 242 numgrps -= ngroups;
759f72186bfdd5 Ming Lei 2021-08-14 243 }
759f72186bfdd5 Ming Lei 2021-08-14 244 }
759f72186bfdd5 Ming Lei 2021-08-14 245
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