From mboxrd@z Thu Jan 1 00:00:00 1970 From: Richard Palethorpe Date: Tue, 13 Apr 2021 08:07:53 +0100 Subject: [LTP] [PATCH v4 7/7] fzsync: Check processor affinity In-Reply-To: <20210413070753.1691-1-rpalethorpe@suse.com> References: <20210413070753.1691-1-rpalethorpe@suse.com> Message-ID: <20210413070753.1691-8-rpalethorpe@suse.com> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: ltp@lists.linux.it It is useful for testing Fuzzy Sync itself to set the CPU affinity to a single core. The current processes affinity does not effect tst_ncpus(), but we can get the affinity separately. Note that checking this still does not guarantee we will use yield when restricted to only one core. We would have to periodically probe which CPUs threads are running on until we detect more than one CPU. Reviewed-by: Leo Yu-Chi Liang Signed-off-by: Richard Palethorpe Reviewed-by: Cyril Hrubis Acked-by: Petr Vorel Reviewed-by: Li Wang --- include/tst_fuzzy_sync.h | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/include/tst_fuzzy_sync.h b/include/tst_fuzzy_sync.h index 36a604e13..8f97bb8f6 100644 --- a/include/tst_fuzzy_sync.h +++ b/include/tst_fuzzy_sync.h @@ -61,7 +61,6 @@ #include #include -#include #include #include #include @@ -218,7 +217,9 @@ static void tst_fzsync_pair_init(struct tst_fzsync_pair *pair) CHK(max_dev_ratio, 0, 1, 0.1); CHK(exec_time_p, 0, 1, 0.5); CHK(exec_loops, 20, INT_MAX, 3000000); - CHK(yield_in_wait, 0, 1, (tst_ncpus() <= 1)); + + if (tst_ncpus_available() <= 1) + pair->yield_in_wait = 1; } #undef CHK -- 2.30.2