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38 lines
1.1 KiB
38 lines
1.1 KiB
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (c) 2018 FUJITSU LIMITED. All rights reserved.
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* Author(s): Xiao Yang <yangx.jy@cn.fujitsu.com>
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*/
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#define TST_NO_DEFAULT_MAIN
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#include <unistd.h>
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#include "tst_test.h"
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#include "ksm_helper.h"
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void wait_ksmd_full_scan(void)
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{
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unsigned long full_scans, at_least_one_full_scan;
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int count = 0;
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SAFE_FILE_SCANF(PATH_KSM "full_scans", "%lu", &full_scans);
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/*
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* The current scan is already in progress so we can't guarantee that
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* the get_user_pages() is called on every existing rmap_item if we
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* only waited for the remaining part of the scan.
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*
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* The actual merging happens after the unstable tree has been built so
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* we need to wait at least two full scans to guarantee merging, hence
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* wait full_scans to increment by 3 so that at least two full scans
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* will run.
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*/
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at_least_one_full_scan = full_scans + 3;
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while (full_scans < at_least_one_full_scan) {
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sleep(1);
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count++;
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SAFE_FILE_SCANF(PATH_KSM "full_scans", "%lu", &full_scans);
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}
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tst_res(TINFO, "ksm daemon takes %ds to run two full scans", count);
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}
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