From patchwork Tue Feb 11 21:31:25 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mina Almasry X-Patchwork-Id: 11376949 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 5D4BC14E3 for ; Tue, 11 Feb 2020 21:32:19 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 3BCE720842 for ; Tue, 11 Feb 2020 21:32:19 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="BtgkPLXM" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727810AbgBKVcB (ORCPT ); Tue, 11 Feb 2020 16:32:01 -0500 Received: from mail-pj1-f74.google.com ([209.85.216.74]:54217 "EHLO mail-pj1-f74.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727799AbgBKVcA (ORCPT ); Tue, 11 Feb 2020 16:32:00 -0500 Received: by mail-pj1-f74.google.com with SMTP id h6so2320778pju.3 for ; Tue, 11 Feb 2020 13:31:59 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=date:in-reply-to:message-id:mime-version:references:subject:from:to :cc; bh=bX7NhEua2ERlz39Th9iBgSOUAYmxb/RK4PMlnkgxhw4=; b=BtgkPLXMThgu/syUKS8v1hUUBJzr5rr4sugkb9U9SmG8EucdUE3NmJbmN7UD6vglUU qDnC1J5nk/4LnxTOic1kCFOOGFJJRZ9V/O/kuWTyaiwnYfI3oObcxuAI04Fv/jq+WuEf Y6jvrEVvln+iEZM9lw3JUOpeFGyc+vVRpXSXva72q5J5WDe2JF3XPDxM+U6mXMReiu1D 3n3fys+4aVKQKjoxjbpRbekY39o1sq+Gpb4CeLpVUdJHbfLd9CbY76o22Dpp3UGfd7aY CasIqzzCJj3ozmFDqINalnmQdPE1mexaVaklhVzoGmJA5x1NJsd0K69Sck/ut/8djAFQ MHkw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=bX7NhEua2ERlz39Th9iBgSOUAYmxb/RK4PMlnkgxhw4=; b=nsGhQubdWhRdn1wqB23uMP7Sw8OMFYPd5iF+tCEVmnAmKtnl70bfh3bkQYfBK+vBO/ 3Ledypu0cLqBk/gwCA5zKIwyYekzCT4rdG1snv9FF0rD2TTeCHkT8RDIsO48f0f+pMeP 1RHx605DW8t216YVNLkFqSY2qiu7QB9rk/nW3Onqdx/gawY9+phAkXpA4xLZu3utEmIC Nw08br4e8qAFuzfKTyKqi4rlyxFr9rshoejU+Zqlv3+uQy8j89EfjL6azDBOxtxzbR1U JSyGAXR5O0ywgmRksoZqIM+GOwy9eosNaF/JxF/naMrDCcoRv/JD3Nmy1s9sbV1gkEVJ w3gw== X-Gm-Message-State: APjAAAXMvvoGvV/W9vaOYBkBckeKCMyhnTMdgFC/WCGBdAaHOgquuoFq AXCc+rwuRGsZqrENOus5vKVybYCnQKkUofELVA== X-Google-Smtp-Source: APXvYqx0QPMNZu65+W4/JoT3ENr3G6zoSw5leGNsERt3DujmNIf57u3bpNm6BKn3IwAszRlwDO81dHDN9qXxBtx6IQ== X-Received: by 2002:a63:ed49:: with SMTP id m9mr8752932pgk.304.1581456718652; Tue, 11 Feb 2020 13:31:58 -0800 (PST) Date: Tue, 11 Feb 2020 13:31:25 -0800 In-Reply-To: <20200211213128.73302-1-almasrymina@google.com> Message-Id: <20200211213128.73302-6-almasrymina@google.com> Mime-Version: 1.0 References: <20200211213128.73302-1-almasrymina@google.com> X-Mailer: git-send-email 2.25.0.225.g125e21ebc7-goog Subject: [PATCH v12 6/9] hugetlb_cgroup: support noreserve mappings From: Mina Almasry To: mike.kravetz@oracle.com Cc: shuah@kernel.org, almasrymina@google.com, rientjes@google.com, shakeelb@google.com, gthelen@google.com, akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-kselftest@vger.kernel.org, cgroups@vger.kernel.org Sender: linux-kselftest-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org Support MAP_NORESERVE accounting as part of the new counter. For each hugepage allocation, at allocation time we check if there is a reservation for this allocation or not. If there is a reservation for this allocation, then this allocation was charged at reservation time, and we don't re-account it. If there is no reserevation for this allocation, we charge the appropriate hugetlb_cgroup. The hugetlb_cgroup to uncharge for this allocation is stored in page[3].private. We use new APIs added in an earlier patch to set this pointer. Signed-off-by: Mina Almasry Reviewed-by: Mike Kravetz --- Changes in v12: - Minor rebase to new interface for readability. Changes in v10: - Refactored deferred_reserve check. --- mm/hugetlb.c | 27 ++++++++++++++++++++++++++- 1 file changed, 26 insertions(+), 1 deletion(-) -- 2.25.0.225.g125e21ebc7-goog diff --git a/mm/hugetlb.c b/mm/hugetlb.c index a9171c3cbed6b..2d62dd35399db 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -1342,6 +1342,8 @@ static void __free_huge_page(struct page *page) clear_page_huge_active(page); hugetlb_cgroup_uncharge_page(hstate_index(h), pages_per_huge_page(h), page); + hugetlb_cgroup_uncharge_page_rsvd(hstate_index(h), + pages_per_huge_page(h), page); if (restore_reserve) h->resv_huge_pages++; @@ -2175,6 +2177,7 @@ struct page *alloc_huge_page(struct vm_area_struct *vma, long gbl_chg; int ret, idx; struct hugetlb_cgroup *h_cg; + bool deferred_reserve; idx = hstate_index(h); /* @@ -2212,9 +2215,19 @@ struct page *alloc_huge_page(struct vm_area_struct *vma, gbl_chg = 1; } + /* If this allocation is not consuming a reservation, charge it now. + */ + deferred_reserve = map_chg || avoid_reserve || !vma_resv_map(vma); + if (deferred_reserve) { + ret = hugetlb_cgroup_charge_cgroup_rsvd( + idx, pages_per_huge_page(h), &h_cg); + if (ret) + goto out_subpool_put; + } + ret = hugetlb_cgroup_charge_cgroup(idx, pages_per_huge_page(h), &h_cg); if (ret) - goto out_subpool_put; + goto out_uncharge_cgroup_reservation; spin_lock(&hugetlb_lock); /* @@ -2237,6 +2250,14 @@ struct page *alloc_huge_page(struct vm_area_struct *vma, /* Fall through */ } hugetlb_cgroup_commit_charge(idx, pages_per_huge_page(h), h_cg, page); + /* If allocation is not consuming a reservation, also store the + * hugetlb_cgroup pointer on the page. + */ + if (deferred_reserve) { + hugetlb_cgroup_commit_charge_rsvd(idx, pages_per_huge_page(h), + h_cg, page); + } + spin_unlock(&hugetlb_lock); set_page_private(page, (unsigned long)spool); @@ -2261,6 +2282,10 @@ struct page *alloc_huge_page(struct vm_area_struct *vma, out_uncharge_cgroup: hugetlb_cgroup_uncharge_cgroup(idx, pages_per_huge_page(h), h_cg); +out_uncharge_cgroup_reservation: + if (deferred_reserve) + hugetlb_cgroup_uncharge_cgroup_rsvd(idx, pages_per_huge_page(h), + h_cg); out_subpool_put: if (map_chg || avoid_reserve) hugepage_subpool_put_pages(spool, 1);