From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.0 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, UNWANTED_LANGUAGE_BODY,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id CC33AC433E5 for ; Mon, 22 Jun 2020 19:29:25 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 7D66A2073E for ; Mon, 22 Jun 2020 19:29:25 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="aSwM6DsY" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 7D66A2073E Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 2A70F6B000C; Mon, 22 Jun 2020 15:29:25 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 2566D6B000D; Mon, 22 Jun 2020 15:29:25 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 0A8C26B0010; Mon, 22 Jun 2020 15:29:25 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0018.hostedemail.com [216.40.44.18]) by kanga.kvack.org (Postfix) with ESMTP id E0B246B000C for ; Mon, 22 Jun 2020 15:29:24 -0400 (EDT) Received: from smtpin20.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay04.hostedemail.com (Postfix) with ESMTP id A5581220C75 for ; Mon, 22 Jun 2020 19:29:24 +0000 (UTC) X-FDA: 76957836648.20.match57_291075c26e35 Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin20.hostedemail.com (Postfix) with ESMTP id 76979182A041D for ; Mon, 22 Jun 2020 19:29:24 +0000 (UTC) X-HE-Tag: match57_291075c26e35 X-Filterd-Recvd-Size: 9304 Received: from mail-pg1-f195.google.com (mail-pg1-f195.google.com [209.85.215.195]) by imf13.hostedemail.com (Postfix) with ESMTP for ; Mon, 22 Jun 2020 19:29:23 +0000 (UTC) Received: by mail-pg1-f195.google.com with SMTP id z5so182919pgb.6 for ; Mon, 22 Jun 2020 12:29:23 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=sender:from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=8Ul/VyioCZgSyOOWRzsGy5FBJiYJTcxPpaUmWpPopUw=; b=aSwM6DsYB1/dpxaO1GdMEYGz5So4Bsx1gHNxIcRQmwSHWyd2LDIyy526R7Dm3vg/U0 hPW8FovOHjF3ncjzSwNS49l65o4mEwt+stfbXxbXTtabuP9VzJKt5kNpsKqf8gWbm7e8 Jy7KLq/Oa8nWPd65hZpHq6atvB/hDkCkGB5hzYKgwST5ssIXtMTaX607CWH2DAsebuZc TknY4iL3TlMu7nX6yjVZb1gWo1BmzG1feeMDspM9plW9Ecx/qLNW1DSCzw3r6Hp5ot3y 5HWMB02qByZbhRTIdJ8xnRPm+YzVrRE+zMT+QXXnuQNRfRXjGlzZvKk1PtjLFbK8TCW7 Zqcg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:from:to:cc:subject:date:message-id :in-reply-to:references:mime-version:content-transfer-encoding; bh=8Ul/VyioCZgSyOOWRzsGy5FBJiYJTcxPpaUmWpPopUw=; b=X2fCVzofTkAjxy3IdadS6uYQwI5i6zocsGU5KqEkYy3bbP2twH9JWcCO/8bCQ7BFFU OaBf+k79i0F0a9xDXU5pVIjvz0cJBf6iblAZYYBObedGchMs6r3mY/SHAuFgNBNydry3 KdI4Ql7iOvrZ3CqhtIYbLp+RutzRHQErODv4aeJiTzYkYRIwFrOIjnqFyzOfKeKoPmqg WnkwX0gF9iQEZsHAivyxhCLB/AZPUXj7NHqmCoTxSft0+nqv5RgGPIO3yqDKAkAblliU 4w2XKieBoZzwZ+v88K/y3iQOwSwcB6kK4hFUklJDmEsb01SpJXCEIIRC8sdu1AIGVyNz dM6A== X-Gm-Message-State: AOAM530HlzW/hmrLgbu0GXJglwqirM7zOUmclq+H6azH7YIx1/gMAipq XWfJ1l29cl4lC+Zk/746eKg= X-Google-Smtp-Source: ABdhPJw2WQbvHFWoo0cnD9rBNEULjMl/Sezb/fUY29hFdcN9wqV/dwQmcM+u/jI25YdJul3DpG7Ejg== X-Received: by 2002:a63:cd4d:: with SMTP id a13mr14285541pgj.49.1592854163147; Mon, 22 Jun 2020 12:29:23 -0700 (PDT) Received: from bbox-1.mtv.corp.google.com ([2620:15c:211:1:3e01:2939:5992:52da]) by smtp.gmail.com with ESMTPSA id mu17sm264603pjb.53.2020.06.22.12.29.20 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 22 Jun 2020 12:29:21 -0700 (PDT) From: Minchan Kim To: Andrew Morton Cc: LKML , Christian Brauner , linux-mm , linux-api@vger.kernel.org, oleksandr@redhat.com, Suren Baghdasaryan , Tim Murray , Sandeep Patil , Sonny Rao , Brian Geffon , Michal Hocko , Johannes Weiner , Shakeel Butt , John Dias , Joel Fernandes , Jann Horn , alexander.h.duyck@linux.intel.com, sj38.park@gmail.com, David Rientjes , Arjun Roy , Minchan Kim , Vlastimil Babka , Christian Brauner , Daniel Colascione , Jens Axboe , Kirill Tkhai , SeongJae Park , linux-man@vger.kernel.org Subject: [PATCH v8 4/4] mm/madvise: check fatal signal pending of target process Date: Mon, 22 Jun 2020 12:29:00 -0700 Message-Id: <20200622192900.22757-5-minchan@kernel.org> X-Mailer: git-send-email 2.27.0.111.gc72c7da667-goog In-Reply-To: <20200622192900.22757-1-minchan@kernel.org> References: <20200622192900.22757-1-minchan@kernel.org> MIME-Version: 1.0 X-Rspamd-Queue-Id: 76979182A041D X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam04 Content-Transfer-Encoding: quoted-printable 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: Bail out to prevent unnecessary CPU overhead if target process has pendin= g fatal signal during (MADV_COLD|MADV_PAGEOUT) operation. Link: http://lkml.kernel.org/r/20200302193630.68771-4-minchan@kernel.org Signed-off-by: Minchan Kim Reviewed-by: Suren Baghdasaryan Reviewed-by: Vlastimil Babka Cc: Alexander Duyck Cc: Brian Geffon Cc: Christian Brauner Cc: Daniel Colascione Cc: Jann Horn Cc: Jens Axboe Cc: Joel Fernandes Cc: Johannes Weiner Cc: John Dias Cc: Kirill Tkhai Cc: Michal Hocko Cc: Oleksandr Natalenko Cc: Sandeep Patil Cc: SeongJae Park Cc: SeongJae Park Cc: Shakeel Butt Cc: Sonny Rao Cc: Tim Murray Cc: Christian Brauner Cc: --- mm/madvise.c | 29 +++++++++++++++++++++-------- 1 file changed, 21 insertions(+), 8 deletions(-) diff --git a/mm/madvise.c b/mm/madvise.c index 23abca3f93fa..a16dba21cdf6 100644 --- a/mm/madvise.c +++ b/mm/madvise.c @@ -39,6 +39,7 @@ struct madvise_walk_private { struct mmu_gather *tlb; bool pageout; + struct task_struct *target_task; }; =20 /* @@ -319,6 +320,10 @@ static int madvise_cold_or_pageout_pte_range(pmd_t *= pmd, if (fatal_signal_pending(current)) return -EINTR; =20 + if (private->target_task && + fatal_signal_pending(private->target_task)) + return -EINTR; + #ifdef CONFIG_TRANSPARENT_HUGEPAGE if (pmd_trans_huge(*pmd)) { pmd_t orig_pmd; @@ -480,12 +485,14 @@ static const struct mm_walk_ops cold_walk_ops =3D { }; =20 static void madvise_cold_page_range(struct mmu_gather *tlb, + struct task_struct *task, struct vm_area_struct *vma, unsigned long addr, unsigned long end) { struct madvise_walk_private walk_private =3D { .pageout =3D false, .tlb =3D tlb, + .target_task =3D task, }; =20 tlb_start_vma(tlb, vma); @@ -493,7 +500,8 @@ static void madvise_cold_page_range(struct mmu_gather= *tlb, tlb_end_vma(tlb, vma); } =20 -static long madvise_cold(struct vm_area_struct *vma, +static long madvise_cold(struct task_struct *task, + struct vm_area_struct *vma, struct vm_area_struct **prev, unsigned long start_addr, unsigned long end_addr) { @@ -506,19 +514,21 @@ static long madvise_cold(struct vm_area_struct *vma= , =20 lru_add_drain(); tlb_gather_mmu(&tlb, mm, start_addr, end_addr); - madvise_cold_page_range(&tlb, vma, start_addr, end_addr); + madvise_cold_page_range(&tlb, task, vma, start_addr, end_addr); tlb_finish_mmu(&tlb, start_addr, end_addr); =20 return 0; } =20 static void madvise_pageout_page_range(struct mmu_gather *tlb, + struct task_struct *task, struct vm_area_struct *vma, unsigned long addr, unsigned long end) { struct madvise_walk_private walk_private =3D { .pageout =3D true, .tlb =3D tlb, + .target_task =3D task, }; =20 tlb_start_vma(tlb, vma); @@ -542,7 +552,8 @@ static inline bool can_do_pageout(struct vm_area_stru= ct *vma) inode_permission(file_inode(vma->vm_file), MAY_WRITE) =3D=3D 0; } =20 -static long madvise_pageout(struct vm_area_struct *vma, +static long madvise_pageout(struct task_struct *task, + struct vm_area_struct *vma, struct vm_area_struct **prev, unsigned long start_addr, unsigned long end_addr) { @@ -558,7 +569,7 @@ static long madvise_pageout(struct vm_area_struct *vm= a, =20 lru_add_drain(); tlb_gather_mmu(&tlb, mm, start_addr, end_addr); - madvise_pageout_page_range(&tlb, vma, start_addr, end_addr); + madvise_pageout_page_range(&tlb, task, vma, start_addr, end_addr); tlb_finish_mmu(&tlb, start_addr, end_addr); =20 return 0; @@ -938,7 +949,8 @@ static int madvise_inject_error(int behavior, #endif =20 static long -madvise_vma(struct vm_area_struct *vma, struct vm_area_struct **prev, +madvise_vma(struct task_struct *task, struct vm_area_struct *vma, + struct vm_area_struct **prev, unsigned long start, unsigned long end, int behavior) { switch (behavior) { @@ -947,9 +959,9 @@ madvise_vma(struct vm_area_struct *vma, struct vm_are= a_struct **prev, case MADV_WILLNEED: return madvise_willneed(vma, prev, start, end); case MADV_COLD: - return madvise_cold(vma, prev, start, end); + return madvise_cold(task, vma, prev, start, end); case MADV_PAGEOUT: - return madvise_pageout(vma, prev, start, end); + return madvise_pageout(task, vma, prev, start, end); case MADV_FREE: case MADV_DONTNEED: return madvise_dontneed_free(vma, prev, start, end, behavior); @@ -1166,7 +1178,8 @@ int do_madvise(struct task_struct *target_task, str= uct mm_struct *mm, tmp =3D end; =20 /* Here vma->vm_start <=3D start < tmp <=3D (end|vma->vm_end). */ - error =3D madvise_vma(vma, &prev, start, tmp, behavior); + error =3D madvise_vma(target_task, vma, &prev, + start, tmp, behavior); if (error) goto out; start =3D tmp; --=20 2.27.0.111.gc72c7da667-goog