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[209.85.220.65]) by mx.google.com with SMTPS id c12sor16133855pfr.69.2019.05.19.21.49.58 for (Google Transport Security); Sun, 19 May 2019 21:49:58 -0700 (PDT) Received-SPF: pass (google.com: domain of drinkcat@chromium.org designates 209.85.220.65 as permitted sender) client-ip=209.85.220.65; Authentication-Results: mx.google.com; dkim=pass header.i=@chromium.org header.s=google header.b=mI5vScJ4; spf=pass (google.com: domain of drinkcat@chromium.org designates 209.85.220.65 as permitted sender) smtp.mailfrom=drinkcat@chromium.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=chromium.org DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=xkToWfPhUbXUlBSKuzZG3pFF8m3+cgJ3j1xebIaK/EI=; b=mI5vScJ46CfONQKk0BXuJqgqaOpncnnzaBz3sQRykYdFNJRSapviixTBiuyNXhv3Lj IKXhEYu8bwmxqqhsj4jf31vawxOk5hgaSWCzkrl3jSNirETmZA+np4paeXOlSZGefx++ v/lIzQqsOCjlows+Onq9agp+5xzN+dFq06s1M= X-Google-Smtp-Source: APXvYqwN55gQbIsuZenQKAzA8VBSQYQ1vm8yCPL9giuGjnZvDoaeAZMfk2h4f+nYBl2QObZZzuXkCQ== X-Received: by 2002:a62:ee05:: with SMTP id e5mr76083541pfi.117.1558327798179; Sun, 19 May 2019 21:49:58 -0700 (PDT) Received: from drinkcat2.tpe.corp.google.com ([2401:fa00:1:b:d8b7:33af:adcb:b648]) by smtp.gmail.com with ESMTPSA id 140sm26022608pfw.123.2019.05.19.21.49.55 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Sun, 19 May 2019 21:49:57 -0700 (PDT) From: Nicolas Boichat To: Andrew Morton Cc: David Rientjes , Nicolas Boichat , Michal Hocko , Joe Perches , Greg Kroah-Hartman , linux-mm@kvack.org, Akinobu Mita , Pekka Enberg , Mel Gorman , linux-kernel@vger.kernel.org Subject: [PATCH] mm/failslab: By default, do not fail allocations with direct reclaim only Date: Mon, 20 May 2019 12:49:51 +0800 Message-Id: <20190520044951.248096-1-drinkcat@chromium.org> X-Mailer: git-send-email 2.21.0.1020.gf2820cf01a-goog MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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: When failslab was originally written, the intention of the "ignore-gfp-wait" flag default value ("N") was to fail GFP_ATOMIC allocations. Those were defined as (__GFP_HIGH), and the code would test for __GFP_WAIT (0x10u). However, since then, __GFP_WAIT was replaced by __GFP_RECLAIM (___GFP_DIRECT_RECLAIM|___GFP_KSWAPD_RECLAIM), and GFP_ATOMIC is now defined as (__GFP_HIGH|__GFP_ATOMIC|__GFP_KSWAPD_RECLAIM). This means that when the flag is false, almost no allocation ever fails (as even GFP_ATOMIC allocations contain __GFP_KSWAPD_RECLAIM). Restore the original intent of the code, by ignoring calls that directly reclaim only (___GFP_DIRECT_RECLAIM), and thus, failing GFP_ATOMIC calls again by default. Fixes: 71baba4b92dc1fa1 ("mm, page_alloc: rename __GFP_WAIT to __GFP_RECLAIM") Signed-off-by: Nicolas Boichat --- mm/failslab.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/mm/failslab.c b/mm/failslab.c index ec5aad211c5be97..33efcb60e633c0a 100644 --- a/mm/failslab.c +++ b/mm/failslab.c @@ -23,7 +23,8 @@ bool __should_failslab(struct kmem_cache *s, gfp_t gfpflags) if (gfpflags & __GFP_NOFAIL) return false; - if (failslab.ignore_gfp_reclaim && (gfpflags & __GFP_RECLAIM)) + if (failslab.ignore_gfp_reclaim && + (gfpflags & ___GFP_DIRECT_RECLAIM)) return false; if (failslab.cache_filter && !(s->flags & SLAB_FAILSLAB)) -- 2.21.0.1020.gf2820cf01a-goog