1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Copyright (c) 2018 FUJITSU LIMITED. All rights reserved. 4 * Author(s): Xiao Yang <yangx.jy@cn.fujitsu.com> 5 */ 6 7 #define TST_NO_DEFAULT_MAIN 8 9 #include <unistd.h> 10 #include "tst_test.h" 11 #include "ksm_helper.h" 12 wait_ksmd_full_scan(void)13void wait_ksmd_full_scan(void) 14 { 15 unsigned long full_scans, at_least_one_full_scan; 16 int count = 0; 17 18 SAFE_FILE_SCANF(PATH_KSM "full_scans", "%lu", &full_scans); 19 /* 20 * The current scan is already in progress so we can't guarantee that 21 * the get_user_pages() is called on every existing rmap_item if we 22 * only waited for the remaining part of the scan. 23 * 24 * The actual merging happens after the unstable tree has been built so 25 * we need to wait at least two full scans to guarantee merging, hence 26 * wait full_scans to increment by 3 so that at least two full scans 27 * will run. 28 */ 29 at_least_one_full_scan = full_scans + 3; 30 while (full_scans < at_least_one_full_scan) { 31 sleep(1); 32 count++; 33 SAFE_FILE_SCANF(PATH_KSM "full_scans", "%lu", &full_scans); 34 } 35 36 tst_res(TINFO, "ksm daemon takes %ds to run two full scans", count); 37 } 38