The KSM developer tells us that we should wait 3~5 increments of the /sys/kernel/mm/ksm/full_scans before checking ksm* testcases's results. Otherwise, there may be some stuck pages that cause the testing failed.
Signed-off-by: Han Pingtian <[email protected]> --- testcases/kernel/mem/lib/mem.c | 29 +++++++++++++++++++++++++++-- 1 files changed, 27 insertions(+), 2 deletions(-) diff --git a/testcases/kernel/mem/lib/mem.c b/testcases/kernel/mem/lib/mem.c index 1a53359..39944b5 100644 --- a/testcases/kernel/mem/lib/mem.c +++ b/testcases/kernel/mem/lib/mem.c @@ -298,8 +298,33 @@ void group_check(int run, int pages_shared, int pages_sharing, int pages_volatile, int pages_unshared, int sleep_millisecs, int pages_to_scan) { - /* 5 seconds for ksm to scan pages. */ - sleep(5); + int fd; + char buf[BUFSIZ]; + int old_num, new_num; + + /* 1 seconds for ksm to scan pages. */ + sleep(1); + + fd = open("/sys/kernel/mm/ksm/full_scans", O_RDONLY); + if (fd == -1) + tst_brkm(TBROK|TERRNO, cleanup, "open"); + + /* wait 3 increments of full_scans */ + if (read(fd, buf, BUFSIZ) == -1) + tst_brkm(TBROK|TERRNO, cleanup, "read"); + old_num = new_num = atoi(buf); + if (lseek(fd, 0, SEEK_SET) == -1) + tst_brkm(TBROK|TERRNO, cleanup, "lseek"); + while (new_num < old_num * 3) { + sleep(1); + if (read(fd, buf, BUFSIZ) < 0) + tst_brkm(TBROK|TERRNO, cleanup, "read"); + new_num = atoi(buf); + if (lseek(fd, 0, SEEK_SET) == -1) + tst_brkm(TBROK|TERRNO, cleanup, "lseek"); + } + close(fd); + tst_resm(TINFO, "check!"); check("run", run); check("pages_shared", pages_shared); -- 1.7.1 ------------------------------------------------------------------------------ The ultimate all-in-one performance toolkit: Intel(R) Parallel Studio XE: Pinpoint memory and threading errors before they happen. Find and fix more than 250 security defects in the development cycle. Locate bottlenecks in serial and parallel code that limit performance. http://p.sf.net/sfu/intel-dev2devfeb _______________________________________________ Ltp-list mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/ltp-list
