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bh=9YgTrscbNX5LAdfQjXqbAWnEA2G3jXjwx4fj1H6fE2I=; b=IU0n/jIqWYz/w5CeTDlSYXIRZCkyK/b5+5FEl7UkP+j3sy5OGoiuF6S5 t7EZj9ssvSSzhkIvp6Z/hoD6WbA7ZB0Xj2ay8PYfEZBFMrJkFMH5iFwHa vyts1Bj7OMyQPy37F0op2MHDODitsC6J3ICOYdkngpiWxfqN6/S+JwTIG xVfAJxCq8PP5PxmXJ5Y9Lx7KQfBo3lCDm6VJG+ZBdPQPl4tjMPMWhyNnQ 3ZJjoZCaJ60tw0nz6UkU+xjrxbrJb2YMea+etBPVNntiJ0tMnX4RuJayB yYbp37xqqIQasdbgIsxI4yQZ976wMLzzDQVeLCf3iB078T8TYULJc66O8 w==; X-IronPort-AV: E=McAfee;i="6500,9779,10605"; a="328823625" X-IronPort-AV: E=Sophos;i="5.97,258,1669104000"; d="scan'208";a="328823625" Received: from orsmga003.jf.intel.com ([10.7.209.27]) by orsmga102.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 30 Jan 2023 04:53:19 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6500,9779,10605"; a="614014987" X-IronPort-AV: E=Sophos;i="5.97,258,1669104000"; d="scan'208";a="614014987" Received: from fyin-dev.sh.intel.com ([10.239.159.32]) by orsmga003.jf.intel.com with ESMTP; 30 Jan 2023 04:53:17 -0800 From: Yin Fengwei To: willy@infradead.org, david@redhat.com, linux-mm@kvack.org Cc: dave.hansen@intel.com, tim.c.chen@intel.com, ying.huang@intel.com, fengwei.yin@intel.com Subject: [RFC PATCH 1/5] mm: Enable fault around for shared file page fault Date: Mon, 30 Jan 2023 20:55:00 +0800 Message-Id: <20230130125504.2509710-2-fengwei.yin@intel.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20230130125504.2509710-1-fengwei.yin@intel.com> References: <20230130125504.2509710-1-fengwei.yin@intel.com> MIME-Version: 1.0 X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: D8F2C40011 X-Stat-Signature: 4hy6313p6wwymdk67fqz74afdcfuj7qk X-Rspam-User: X-HE-Tag: 1675083201-104327 X-HE-Meta: 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 AgStNEgU /DWuEGRpByL3KbY7lF2879jq9UeoDYENm8scZmaqp8KVcpidfL7TEpywdnpO1HSHd+2m2KXNIGpagnkeky3uBWCJv0VliHsMVsjD698/TOdsPgHeLHRNyeAhOYs1MpJZyg0d0imhGUIDXgk3g2wsABYhW6HxilMPRJxVvuxPolh0OPvo= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Allow the batched page table population added to fault around handler and benefit both file read and shared fault. Signed-off-by: Yin Fengwei Reviewed-by: Matthew Wilcox (Oracle) --- mm/memory.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/mm/memory.c b/mm/memory.c index ec833a2e0601..61ccd2d7e6a6 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -4545,6 +4545,17 @@ static vm_fault_t do_shared_fault(struct vm_fault *vmf) struct vm_area_struct *vma = vmf->vma; vm_fault_t ret, tmp; + /* + * Let's call ->map_pages() first and use ->fault() as fallback + * if page by the offset is not ready to be mapped (cold cache or + * something). + */ + if (should_fault_around(vmf)) { + ret = do_fault_around(vmf); + if (ret) + return ret; + } + ret = __do_fault(vmf); if (unlikely(ret & (VM_FAULT_ERROR | VM_FAULT_NOPAGE | VM_FAULT_RETRY))) return ret;