Hi Aaron, Thank you for the patch! Yet something to improve: [auto build test ERROR on hnaz-linux-mm/master] url: https://github.com/0day-ci/linux/commits/Aaron-Tomlin/mm-page_alloc-try-oom-if-reclaim-is-unable-to-make-forward-progress/20210316-010203 base: https://github.com/hnaz/linux-mm master config: powerpc64-randconfig-r012-20210315 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project a28facba1ccdc957f386b7753f4958307f1bfde8) 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 powerpc64 cross compiling tool for clang build # apt-get install binutils-powerpc64-linux-gnu # https://github.com/0day-ci/linux/commit/77338aaff2606a7715c832545e79370e849e3b4e git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Aaron-Tomlin/mm-page_alloc-try-oom-if-reclaim-is-unable-to-make-forward-progress/20210316-010203 git checkout 77338aaff2606a7715c832545e79370e849e3b4e # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=powerpc64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@xxxxxxxxx> All errors (new ones prefixed by >>): mm/page_alloc.c:2538:5: warning: no previous prototype for function 'find_suitable_fallback' [-Wmissing-prototypes] int find_suitable_fallback(struct free_area *area, unsigned int order, ^ mm/page_alloc.c:2538:1: note: declare 'static' if the function is not intended to be used outside of this translation unit int find_suitable_fallback(struct free_area *area, unsigned int order, ^ static >> mm/page_alloc.c:4444:3: error: use of undeclared identifier 'result' result false; ^ >> mm/page_alloc.c:4447:50: error: expected ';' after return statement return unreserve_highatomic_pageblock(ac, true) ^ ; >> mm/page_alloc.c:4507:2: error: expected expression else ^ >> mm/page_alloc.c:4719:6: error: implicit declaration of function 'should_try_oom' [-Werror,-Wimplicit-function-declaration] if (should_try_oom(no_progress_loops, compact_result)) ^ >> mm/page_alloc.c:4720:11: error: expected ';' after goto statement goto oom: ^ ; mm/page_alloc.c:6136:23: warning: no previous prototype for function 'memmap_init' [-Wmissing-prototypes] void __meminit __weak memmap_init(unsigned long size, int nid, ^ mm/page_alloc.c:6136:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void __meminit __weak memmap_init(unsigned long size, int nid, ^ static 2 warnings and 5 errors generated. vim +/result +4444 mm/page_alloc.c 4409 4410 /* 4411 * Checks whether it makes sense to retry the reclaim to make a forward progress 4412 * for the given allocation request. 4413 * 4414 * We give up when we either have tried MAX_RECLAIM_RETRIES in a row 4415 * without success, or when we couldn't even meet the watermark if we 4416 * reclaimed all remaining pages on the LRU lists. 4417 * 4418 * Returns true if a retry is viable or false to enter the oom path. 4419 */ 4420 static inline bool 4421 should_reclaim_retry(gfp_t gfp_mask, unsigned order, 4422 struct alloc_context *ac, int alloc_flags, 4423 bool did_some_progress, int *no_progress_loops) 4424 { 4425 struct zone *zone; 4426 struct zoneref *z; 4427 bool ret = false; 4428 4429 /* 4430 * Costly allocations might have made a progress but this doesn't mean 4431 * their order will become available due to high fragmentation so 4432 * always increment the no progress counter for them 4433 */ 4434 if (did_some_progress && order <= PAGE_ALLOC_COSTLY_ORDER) 4435 *no_progress_loops = 0; 4436 else 4437 (*no_progress_loops)++; 4438 4439 /* 4440 * Make sure we converge to OOM if we cannot make any progress 4441 * several times in the row. 4442 */ 4443 if (*no_progress_loops > MAX_RECLAIM_RETRIES) > 4444 result false; 4445 /* Last chance before OOM, try draining highatomic_reserve once */ 4446 else if (*no_progress_loops == MAX_RECLAIM_RETRIES) > 4447 return unreserve_highatomic_pageblock(ac, true) 4448 4449 /* 4450 * Keep reclaiming pages while there is a chance this will lead 4451 * somewhere. If none of the target zones can satisfy our allocation 4452 * request even if all reclaimable pages are considered then we are 4453 * screwed and have to go OOM. 4454 */ 4455 for_each_zone_zonelist_nodemask(zone, z, ac->zonelist, 4456 ac->highest_zoneidx, ac->nodemask) { 4457 unsigned long available; 4458 unsigned long reclaimable; 4459 unsigned long min_wmark = min_wmark_pages(zone); 4460 bool wmark; 4461 4462 available = reclaimable = zone_reclaimable_pages(zone); 4463 available += zone_page_state_snapshot(zone, NR_FREE_PAGES); 4464 4465 /* 4466 * Would the allocation succeed if we reclaimed all 4467 * reclaimable pages? 4468 */ 4469 wmark = __zone_watermark_ok(zone, order, min_wmark, 4470 ac->highest_zoneidx, alloc_flags, available); 4471 trace_reclaim_retry_zone(z, order, reclaimable, 4472 available, min_wmark, *no_progress_loops, wmark); 4473 if (wmark) { 4474 /* 4475 * If we didn't make any progress and have a lot of 4476 * dirty + writeback pages then we should wait for 4477 * an IO to complete to slow down the reclaim and 4478 * prevent from pre mature OOM 4479 */ 4480 if (!did_some_progress) { 4481 unsigned long write_pending; 4482 4483 write_pending = zone_page_state_snapshot(zone, 4484 NR_ZONE_WRITE_PENDING); 4485 4486 if (2 * write_pending > reclaimable) { 4487 congestion_wait(BLK_RW_ASYNC, HZ/10); 4488 return true; 4489 } 4490 } 4491 4492 ret = true; 4493 goto out; 4494 } 4495 } 4496 4497 out: 4498 /* 4499 * Memory allocation/reclaim might be called from a WQ context and the 4500 * current implementation of the WQ concurrency control doesn't 4501 * recognize that a particular WQ is congested if the worker thread is 4502 * looping without ever sleeping. Therefore we have to do a short sleep 4503 * here rather than calling cond_resched(). 4504 */ 4505 if (current->flags & PF_WQ_WORKER) 4506 schedule_timeout_uninterruptible(1); > 4507 else 4508 cond_resched(); 4509 return ret; 4510 } 4511 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
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