tree: https://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup.git review-iow head: e2209ac1daf46cd980f6b912c30a910a78f7da24 commit: 3ddd9fc7fba6e817f95c3baa7731826a3e6cbd2c [15/17] blkcg: implement blk-ioweight config: sh-allmodconfig (attached as .config) compiler: sh4-linux-gcc (GCC) 7.4.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross git checkout 3ddd9fc7fba6e817f95c3baa7731826a3e6cbd2c # save the attached .config to linux build tree GCC_VERSION=7.4.0 make.cross ARCH=sh If you fix the issue, kindly add following tag Reported-by: kbuild test robot <lkp@xxxxxxxxx> All warnings (new ones prefixed by >>): >> block/blk-ioweight.c:263:24: warning: integer overflow in expression [-Woverflow] AUTOP_CYCLE_NSEC = 10 * NSEC_PER_SEC, ^ >> block/blk-ioweight.c:557:4: warning: this decimal constant is unsigned only in ISO C90 [I_LCOEF_RBPS] = 2338259289, ^ vim +263 block/blk-ioweight.c 183 184 enum { 185 MILLION = 1000000, 186 187 /* timer period is calculated from latency requirements, bound it */ 188 MIN_PERIOD = USEC_PER_MSEC, 189 MAX_PERIOD = USEC_PER_SEC, 190 191 /* 192 * A cgroup's vtime can run 50% behind the device vtime, which 193 * serves as its IO credit buffer. Surplus weight adjustment is 194 * immediately canceled if the vtime margin runs below 10%. 195 */ 196 MARGIN_PCT = 50, 197 INUSE_MARGIN_PCT = 10, 198 199 /* Have some play in waitq timer operations */ 200 WAITQ_TIMER_MARGIN_PCT = 5, 201 202 /* 203 * vtime can wrap well within a reasonable uptime when vrate is 204 * consistently raised. Don't trust recorded cgroup vtime if the 205 * period counter indicates that it's older than 5mins. 206 */ 207 VTIME_VALID_DUR = 300 * USEC_PER_SEC, 208 209 /* 210 * Remember the past three non-zero usages and use the max for 211 * surplus calculation. Three slots guarantee that we remember one 212 * full period usage from the last active stretch even after 213 * partial deactivation and re-activation periods. Don't start 214 * giving away weight before collecting two data points to prevent 215 * hweight adjustments based on one partial activation period. 216 */ 217 NR_USAGE_SLOTS = 3, 218 MIN_VALID_USAGES = 2, 219 220 /* 1/64k is granular enough and can easily be handled w/ u32 */ 221 HWEIGHT_WHOLE = 1 << 16, 222 223 /* 224 * As vtime is used to calculate the cost of each IO, it needs to 225 * be fairly high precision. For example, it should be able to 226 * represent the cost of a single page worth of discard with 227 * suffificient accuracy. At the same time, it should be able to 228 * represent reasonably long enough durations to be useful and 229 * convenient during operation. 230 * 231 * 1s worth of vtime is 2^37. This gives us both sub-nanosecond 232 * granularity and days of wrap-around time even at extreme vrates. 233 */ 234 VTIME_PER_SEC_SHIFT = 37, 235 VTIME_PER_SEC = 1LLU << VTIME_PER_SEC_SHIFT, 236 VTIME_PER_USEC = VTIME_PER_SEC / USEC_PER_SEC, 237 238 /* bound vrate adjustments within two orders of magnitude */ 239 VRATE_MIN_PPM = 10000, /* 1% */ 240 VRATE_MAX_PPM = 100000000, /* 10000% */ 241 242 VRATE_MIN = VTIME_PER_USEC * VRATE_MIN_PPM / MILLION, 243 VRATE_CLAMP_ADJ_PCT = 4, 244 245 /* if IOs end up waiting for requests, issue less */ 246 RQ_WAIT_BUSY_PCT = 5, 247 248 /* unbusy hysterisis */ 249 UNBUSY_THR_PCT = 75, 250 251 /* don't let cmds which take a very long time pin lagging for too long */ 252 MAX_LAGGING_PERIODS = 10, 253 254 /* 255 * If usage% * 1.25 + 2% is lower than hweight% by more than 3%, 256 * donate the surplus. 257 */ 258 SURPLUS_SCALE_PCT = 125, /* * 125% */ 259 SURPLUS_SCALE_ABS = HWEIGHT_WHOLE / 50, /* + 2% */ 260 SURPLUS_MIN_ADJ_DELTA = HWEIGHT_WHOLE / 33, /* 3% */ 261 262 /* switch iff the conditions are met for longer than this */ > 263 AUTOP_CYCLE_NSEC = 10 * NSEC_PER_SEC, 264 265 /* 266 * Count IO size in 4k pages. The 12bit shift helps keeping 267 * size-proportional components of cost calculation in closer 268 * numbers of digits to per-IO cost components. 269 */ 270 IOW_PAGE_SHIFT = 12, 271 IOW_PAGE_SIZE = 1 << IOW_PAGE_SHIFT, 272 IOW_SECT_TO_PAGE_SHIFT = IOW_PAGE_SHIFT - SECTOR_SHIFT, 273 274 /* if apart further than 16M, consider randio for linear model */ 275 LCOEF_RANDIO_PAGES = 4096, 276 }; 277 --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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