From nobody Wed Dec 17 12:25:15 2025 Received: from mail-pl1-f176.google.com (mail-pl1-f176.google.com [209.85.214.176]) (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 46738157495 for ; Sun, 10 Nov 2024 15:29:27 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.176 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1731252569; cv=none; b=r2mZP7l6PckF2uO1c8GtxXCyodJBselXFr7lgeQKLao0wIkI8Bsru0xLETiy+DlPrrTgV25Y16FQwoz4nq08jGsH9hVeqNUo2lcklewNTLQJJOejBUnWdhEROVfHOYFo3qmD4peIHUHgf0/MPUzgbsWdmC0vJyjU55txi//IbH8= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1731252569; c=relaxed/simple; bh=AKt+S745U93BEmbA6t/wcRBIgQj/soY+rT3nJS7qXJU=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=LD4RIP+zzSqoN3B2FslaPh4xMUKPnPkufEjX5gwVsf02GV5R02GXbLhe6v9Pz58g0JjWzCc6N2VL/HPsybsmieSAHpTsmo5qUU2pU9iBOCUk0S1D10htoY5iFC0l4tmH+wziG+e/wRFVt6vZ7RJiee0BJq+k9k//w3XsIKSsGBU= 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=jpxkdGSA; arc=none smtp.client-ip=209.85.214.176 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="jpxkdGSA" Received: by mail-pl1-f176.google.com with SMTP id d9443c01a7336-20c9978a221so42261175ad.1 for ; Sun, 10 Nov 2024 07:29:27 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel-dk.20230601.gappssmtp.com; s=20230601; t=1731252566; x=1731857366; 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=xtqsp3FpRWE9h3nra5m9D1cpUkXI8hkSCKuFCrWSblw=; b=jpxkdGSACE2RIfxZR30I6RLxlbnIVcV8CQP+caD3TJTf9MGEGC2rENCIMrdqFSyPRW sximQLDX7ngw6JwKo6AoBMqN06YroHpC69obYTg9zcR5TfthsZZKuRbYrE4DxXnDpU+W yNp+1ynCzu3wN3TExVe/C0PsKAYsSkZusARdnCjiszGVukDMpprVY8wcpxSJn8tJNM/A DojcecxZxsAZafCdfcjlenpPY0f1UhUBl2p0KFkYWWdxG3LXKTHoTUbrm22m5NvlpL9D tfYK5FwXHhCl7N+++ecZbUuTVnkhOQeBJHYZ0QrL8yM7tLJY1HQ1KkcNb8WwDQTc8uV+ pAjw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1731252566; x=1731857366; 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=xtqsp3FpRWE9h3nra5m9D1cpUkXI8hkSCKuFCrWSblw=; b=c/J9HfKj0Zz4nLmb2lkZGl2BCKcbfiO/U1zLLyR8gjwQWsyQHfhVIlQph8ceRWj6Yo zIpSgR2Un1m9xjDKVvjL+TBc6t0f6zNGGDAwRqJktLpNwE12XQSykGDag7+suPIF1TYb VF+5gZzm9Bx6xHETFCPifnPwQk1pKpVWy2quQUrGRp/rGhnFP5XL1wmkyIkKbI3t16SB pOS+ZtynNgfeO3ORjj693yRDSPBsHw/PKQVRWOlMrsVDpyhvNVsuYipVQ12UBgkq39dp GoVDIyTaJpcCGYnuHylZw0fAD9epF7MOMyElTlAJaTmj8bS8iqC3/QVda7Mo7LMfc8pZ pP3w== X-Forwarded-Encrypted: i=1; AJvYcCWFW7s0rMQpjICmIPl9DFfMUoIGEIzNGrQFNgMnOQgMtSFlPnWWOMFe4TeR67bmLour5o8gGb4xh6YOMv0=@vger.kernel.org X-Gm-Message-State: AOJu0YwWy/reIqrfJjqdKR5f+WTm0pMAfC8k+5krfbFKM3s+zBHNkVCz iuImEQjfPUG/RXg+JjzaF1AIQAu1LQLWEP23uxnEUhlpFAdEX5GiVeGSotxCFP4= X-Google-Smtp-Source: AGHT+IF5qTNuztLawL22nFdoWM3hBa8g+iEMn3AucUKZX2m0zot7CflQJgWfjjOvLTZBT0mpwh+/bA== X-Received: by 2002:a17:902:cf02:b0:20c:af07:a816 with SMTP id d9443c01a7336-21183d087c7mr129753345ad.31.1731252566678; Sun, 10 Nov 2024 07:29:26 -0800 (PST) Received: from localhost.localdomain ([198.8.77.157]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-2e99a5f935dsm9940973a91.35.2024.11.10.07.29.25 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 10 Nov 2024 07:29:25 -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, Jens Axboe Subject: [PATCH 09/15] mm/filemap: drop uncached pages when writeback completes Date: Sun, 10 Nov 2024 08:28:01 -0700 Message-ID: <20241110152906.1747545-10-axboe@kernel.dk> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20241110152906.1747545-1-axboe@kernel.dk> References: <20241110152906.1747545-1-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 uncached, drop pages when writeback completes. Intended to be used with RWF_UNCACHED, to avoid needing sync writes for uncached IO. Signed-off-by: Jens Axboe --- mm/filemap.c | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+) diff --git a/mm/filemap.c b/mm/filemap.c index bd698340ef24..efd02b047541 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -1600,6 +1600,23 @@ int folio_wait_private_2_killable(struct folio *foli= o) } EXPORT_SYMBOL(folio_wait_private_2_killable); =20 +/* + * If folio was marked as uncached, then pages should be dropped when writ= eback + * completes. Do that now. If we fail, it's likely because of a big folio - + * just reset uncached for that case and latter completions should invalid= ate. + */ +static void folio_end_uncached(struct folio *folio) +{ + bool reset =3D true; + + if (folio_trylock(folio)) { + reset =3D !invalidate_complete_folio2(folio->mapping, folio, 0); + folio_unlock(folio); + } + if (reset) + folio_set_uncached(folio); +} + /** * folio_end_writeback - End writeback against a folio. * @folio: The folio. @@ -1610,6 +1627,8 @@ EXPORT_SYMBOL(folio_wait_private_2_killable); */ void folio_end_writeback(struct folio *folio) { + bool folio_uncached; + VM_BUG_ON_FOLIO(!folio_test_writeback(folio), folio); =20 /* @@ -1631,9 +1650,13 @@ void folio_end_writeback(struct folio *folio) * reused before the folio_wake_bit(). */ folio_get(folio); + folio_uncached =3D folio_test_clear_uncached(folio); if (__folio_end_writeback(folio)) folio_wake_bit(folio, PG_writeback); acct_reclaim_writeback(folio); + + if (folio_uncached) + folio_end_uncached(folio); folio_put(folio); } EXPORT_SYMBOL(folio_end_writeback); --=20 2.45.2