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由 Ding Tianhong 提交于
ascend inclusion category: perf bugzilla: https://gitee.com/openeuler/kernel/issues/I4EUVI CVE: NA ------------------------------------------------- We decide to remove sp_mutex thoroughly and use sp_group_sem instead. Moreover, we use down_read(&spg->rw_lock) instead of down_write(), this increases parallelism of sp_add_group_task(), especially when there are many normal pages in the target sp_group. Test: First a process is added into sp_group 1, then it calls sp_alloc() to get 3.5G normal page memory and 5.5G hugepage memory. Then 30 processes are created and added to sp_group 1 concurrently. The result is as follows. without this patch: 15.0s with this patch: 4.5s gain: 70% Tested-by: NTang Yizhou <tangyizhou@huawei.com> Signed-off-by: NDing Tianhong <dingtianhong@huawei.com> Signed-off-by: NTang Yizhou <tangyizhou@huawei.com> Reviewed-by: NKefeng Wang <wangkefeng.wang@huawei.com> Signed-off-by: NYang Yingliang <yangyingliang@huawei.com> Reviewed-by: NWeilong Chen <chenweilong@huawei.com> Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>
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