From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 0AC3B3C3450 for ; Tue, 8 Sep 2026 12:23:10 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788870191; cv=none; b=Hx/j/sduCXcmHHl+ZAvhfFtYXqxq/gZXD76dhTXxBTbu1Bsc7zOhfNmlocZCpFBS6yS4XJBBR+5cR6FTZbgb+tMKClF8/ILvh1FhPpO+HHd+WM7AZx6DsIv8GYZtwEa4iYRw6Yhno8m+Ovkxcy9ztvo8ZU0pJ68huNkCg9QqL5M= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788870191; c=relaxed/simple; bh=FkAskWQGR9k/2UNfpV09ZtNVLUrBhyVb45VMdOLeYZY=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=qK/+Fq8dXHsIKB03A6DyxoIS5ikGnRV3gjRdiIBM3vbfc7b+gi8mu466eD/SyW+LGDpt1XRQjR5u8Lyy3OCztcz9SW8vV+degyTqYCK8hSt5rx5/TxbJlPEhGdJfGXu3VA+xR5Bwg0gRXez00v/d073C2B1hvnh7ZQMzrwYs+/c= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=i7wCTODR; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="i7wCTODR" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 039841F00A3D; Tue, 8 Sep 2026 12:23:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1788870189; bh=aKO8anCYGcnb/OXRQiI4kbt2lCHpmv4RnbnceUHiCXM=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=i7wCTODR9DtNGScr/lOgV/jBLSlWm9MCexe584RmY2Bdk58wqA5SI6qz7SA3Xs1oo TLu3+4EoYw10BCwJWk61BYzhyMMeclLerXeJg33JIn9DJuNnaJZUBr3Xv6w2VvC3GZ +hklwu3+UWB9ydzVS8uwukIuLiFiLkVRyBZ7GL0r0/jsgLs4pRkwAEjA+OQySkLuWn 3upXGIdpCgJxtj40DyjL2fHq5X+rkNNbU9CyLJ98L5+7kIHxNLlORxaRPqThNJ2EnQ u0E0Bwy5CsmfLhj2wpaGKJORlZev+LybSh1KTY8FJ+aCUdv7bO22mCB/lN0PulT3Ud 70PzNBCejvYQA== Message-ID: <9d614e4b-2ee0-46ca-9de2-b07539f3af22@kernel.org> Date: Tue, 8 Sep 2026 14:23:06 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v4] mm: page_alloc: add missing hooks to bulk allocation path Content-Language: en-US To: Qiqi Liu , akpm@linux-foundation.org Cc: surenb@google.com, mhocko@suse.com, brendan.jackman@linux.dev, hannes@cmpxchg.org, ziy@nvidia.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org, gourry@gourry.net References: <20260907120949.418450-1-liuqiqi@kylinos.cn> <20260908102356.344075-1-liuqiqi@kylinos.cn> From: "Vlastimil Babka (SUSE)" Autocrypt: addr=vbabka@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 9/8/26 12:23, Qiqi Liu wrote: > The bulk allocation path in alloc_pages_bulk_noprof() currently misses > trace_mm_page_alloc() and kmsan_alloc_page() calls, leaving bulk-allocated > pages invisible to ftrace/BPF/perf and leaving KMSAN shadow memory stale. > > Add both calls in the bulk loop to match the standard allocation path, > placing them before set_page_refcounted() for consistency. The gfp mask > passed to kmsan_alloc_page() is stripped of __GFP_RECLAIM because the > bulk loop runs under the PCP spinlock, and KMSAN's stack depot allocation > must not sleep. > > Both are no-ops when their respective features are disabled, so there > is no overhead in production kernels. > > Suggested-by: Gregory Price > Signed-off-by: Qiqi Liu Reviewed-by: Vlastimil Babka (SUSE) > --- > mm/page_alloc.c | 2 ++ > 1 file changed, 2 insertions(+) > > diff --git a/mm/page_alloc.c b/mm/page_alloc.c > index 12fac9084c48..eac419eef697 100644 > --- a/mm/page_alloc.c > +++ b/mm/page_alloc.c > @@ -5279,6 +5279,8 @@ unsigned long alloc_pages_bulk_noprof(gfp_t gfp, int preferred_nid, > nr_account++; > > prep_new_page(page, 0, gfp, ALLOC_DEFAULT); > + trace_mm_page_alloc(page, 0, gfp, ac.migratetype); > + kmsan_alloc_page(page, 0, gfp & ~__GFP_RECLAIM); > set_page_refcounted(page); > page_array[nr_populated++] = page; > }