From nobody Sun Dec 14 21:22:15 2025 Received: from mail-il1-f177.google.com (mail-il1-f177.google.com [209.85.166.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id EFEA121C9FE for ; Fri, 20 Dec 2024 15:48:47 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.177 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734709729; cv=none; b=cG+IFKwtIYM++1NRYT58BQvmEpR39SbVVR1irCbGsCIzY6iYaVbNji+8OzTHn+anWPk6xeXZX1jYakwXPEb8vRzVdjp8aw3OUmo619zHXiP74d3IAfhXoG54QxNUMxvWKFH0DZNHlAeo6M0ANk8zYPM13AQSKyt3BZMUQGwbyE4= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734709729; c=relaxed/simple; bh=0z+Su/j7sFm3LNscSJlbortbXvVAgYiyFzcEVovFWT0=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Z3Y7Xgd+0em+PwmXAPZlouYtUli0jnHcVpRWfxTXn/Af6HaDlOBy/mi0YBW0WZOkmNZ7zHToNe3iuqAXRIbK09MSCrWW8lWsoIpcn8lnipUHFwFT0D9uDMOYtmG3WcZ/R+5H5quM+AXd448xhYpn4dnfEL3LUsSjh0qPN2QqXlU= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=kernel.dk; spf=pass smtp.mailfrom=kernel.dk; dkim=pass (2048-bit key) header.d=kernel-dk.20230601.gappssmtp.com header.i=@kernel-dk.20230601.gappssmtp.com header.b=FPp6vWfm; arc=none smtp.client-ip=209.85.166.177 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=kernel.dk Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=kernel.dk Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel-dk.20230601.gappssmtp.com header.i=@kernel-dk.20230601.gappssmtp.com header.b="FPp6vWfm" Received: by mail-il1-f177.google.com with SMTP id e9e14a558f8ab-3a8160382d4so5926675ab.0 for ; Fri, 20 Dec 2024 07:48:47 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel-dk.20230601.gappssmtp.com; s=20230601; t=1734709727; x=1735314527; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=CWUKIERhmBif0xELkyRs9dlqXC97dRJQR9fjviiscOo=; b=FPp6vWfmmwe9NAWIBJmCxLtVD/hNP3BfSRpL38o0SUhrItLpx26f4Yg2aryhVcVvoM oPpp3NOtj7OKWZxGCnfwcG9g9XNK06KVogtbQHCDg8aY2+KQWK+Gml3annJycylGeLWM VQ1kjdOYDuMMIT7W2aVyIxb1yTomtke8VSfksgOXvvkFxe9p1Wv/YGuGwkhvJgu9kDY3 kxOwEwqwnebKAvLbCMZrqSUwIskcxGhWX71jrH+qY6XTE8r7WH7lFQhuo7xqJStur45R FdMuoeSXbu+PxhnUHTXiYz73dqknNbkjP1X3wZUw36JxSQNonJKRdhryqdAgT7BlbPd4 hl6w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1734709727; x=1735314527; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=CWUKIERhmBif0xELkyRs9dlqXC97dRJQR9fjviiscOo=; b=IGX/D112Q4YJNg5MnrrCtv+3bKbzrvH2AtafMF8BhHSbRTtQ/ayBMQ4v+pxUoCOJCF IpOzftm4LMDIVQlcM0IYcnnOs3qy1h/o3YH4wqmz48j9iFcvHzBAja1z18/3hRbf64qG 0tsJTUQIHxpc0mb6q1Cd5MVoATb7hTpGAN8C+VBie8SSC6Af/fLEHIZditnmEfGj19uS pg+Dk7NFf7teQqENetrm43aufMyt2Fn1bZfnXpyEVAZvmMNMqDQ5QztGR5f5PRAme49H RXu85v4J1J4VyvsL4W6PDKDX0/Ew2zH45q9ajCN8xVwiArpcGA8NED5uQT6YM/FZQTQv 7zYw== X-Forwarded-Encrypted: i=1; AJvYcCXHgdtp5hga1SzB6FCOqwDCucLXKLDRkJL//op5iiw3cxnLV5BWC5DKvRtc+j6yULEQuj6t4u5Df8ZHuLs=@vger.kernel.org X-Gm-Message-State: AOJu0YzeRJMtZhc9FF43nzL49BRpVjMueF20sFL1OSG6zP5Dy+0UBYkO OqLseQNDAxHFNxLDaK4ESibX8mmki6ERsCuugp4yydvR7JgeidcccjCsjAj6cHI= X-Gm-Gg: ASbGnctP72iNiLx2/O1VkT3KisoJ24h+ojwPUw2Izy+Z2cKKqwyzcE2nr5rkpZA2I+S fGJ0uHyG3yj8IsK6KS+UFe4AnsWWijAjaV8DpuQMn/GhpNz/loJlKwqyitnkMqgcsRZGYGBYn2j 3Wgpi/dVfedLgJMHIdikwfsEuzD5e3V9c1SrrwUo6/F5ol6npZZxwoW1mnmCfYgT+BP7QKecWbD UJY1Sz5N82h0okauecjOrVyGIZIoAXPI32oNC+p0kAtaf5UN+YcYyCb9+Nn X-Google-Smtp-Source: AGHT+IGjD+wBfW2QpC5lojTx62UJZa1o0QwQiIlqK6Hx/4wukTE9KhfBEOmSehD69MzvwKGp6r7FTw== X-Received: by 2002:a05:6e02:522:b0:3a7:e0a5:aa98 with SMTP id e9e14a558f8ab-3c2d2d509b6mr25164805ab.13.1734709727201; Fri, 20 Dec 2024 07:48:47 -0800 (PST) Received: from localhost.localdomain ([96.43.243.2]) by smtp.gmail.com with ESMTPSA id 8926c6da1cb9f-4e68bf66ed9sm837821173.45.2024.12.20.07.48.45 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 20 Dec 2024 07:48:46 -0800 (PST) From: Jens Axboe To: linux-mm@kvack.org, linux-fsdevel@vger.kernel.org Cc: hannes@cmpxchg.org, clm@meta.com, linux-kernel@vger.kernel.org, willy@infradead.org, kirill@shutemov.name, bfoster@redhat.com, Jens Axboe Subject: [PATCH 09/12] mm/filemap: drop streaming/uncached pages when writeback completes Date: Fri, 20 Dec 2024 08:47:47 -0700 Message-ID: <20241220154831.1086649-10-axboe@kernel.dk> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20241220154831.1086649-1-axboe@kernel.dk> References: <20241220154831.1086649-1-axboe@kernel.dk> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" If the folio is marked as streaming, drop pages when writeback completes. Intended to be used with RWF_DONTCACHE, to avoid needing sync writes for uncached IO. Signed-off-by: Jens Axboe --- mm/filemap.c | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+) diff --git a/mm/filemap.c b/mm/filemap.c index dd563208d09d..aa0b3af6533d 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -1599,6 +1599,27 @@ int folio_wait_private_2_killable(struct folio *foli= o) } EXPORT_SYMBOL(folio_wait_private_2_killable); =20 +/* + * If folio was marked as dropbehind, then pages should be dropped when wr= iteback + * completes. Do that now. If we fail, it's likely because of a big folio - + * just reset dropbehind for that case and latter completions should inval= idate. + */ +static void folio_end_dropbehind_write(struct folio *folio) +{ + /* + * Hitting !in_task() should not happen off RWF_DONTCACHE writeback, + * but can happen if normal writeback just happens to find dirty folios + * that were created as part of uncached writeback, and that writeback + * would otherwise not need non-IRQ handling. Just skip the + * invalidation in that case. + */ + if (in_task() && folio_trylock(folio)) { + if (folio->mapping) + folio_unmap_invalidate(folio->mapping, folio, 0); + folio_unlock(folio); + } +} + /** * folio_end_writeback - End writeback against a folio. * @folio: The folio. @@ -1609,6 +1630,8 @@ EXPORT_SYMBOL(folio_wait_private_2_killable); */ void folio_end_writeback(struct folio *folio) { + bool folio_dropbehind =3D false; + VM_BUG_ON_FOLIO(!folio_test_writeback(folio), folio); =20 /* @@ -1630,9 +1653,14 @@ void folio_end_writeback(struct folio *folio) * reused before the folio_wake_bit(). */ folio_get(folio); + if (!folio_test_dirty(folio)) + folio_dropbehind =3D folio_test_clear_dropbehind(folio); if (__folio_end_writeback(folio)) folio_wake_bit(folio, PG_writeback); acct_reclaim_writeback(folio); + + if (folio_dropbehind) + folio_end_dropbehind_write(folio); folio_put(folio); } EXPORT_SYMBOL(folio_end_writeback); --=20 2.45.2