From patchwork Mon Feb 12 21:39:20 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Suren Baghdasaryan X-Patchwork-Id: 13554036 Received: from mail-yw1-f202.google.com (mail-yw1-f202.google.com [209.85.128.202]) (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 5273F5F578 for ; Mon, 12 Feb 2024 21:40:47 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.202 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1707774049; cv=none; b=ph7AIyib5Ksj9mxaf30ZthKDugSLJGFtSPrs+hYaNq6oEKJjL4hCUvQi2A9/s4PBnNTXUwNen5vgbPCnCWP1SaOae632qGkfN3bqGxGrLH2xYdxmr56hCMab4ajNkFz8ee8ZviEd1yTfAtzOPo4SRjn/aglVezCRG+3pgFwXym4= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1707774049; c=relaxed/simple; bh=rFxOazRmJvXVDMBFp+0gxbyGbXjSs9OXcenRjz5zrp8=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=dRE+MWvMxw8M9r6bSU9XCPwxaf+VWkYp5B5EVtCiD9QrTRhHYXg/8k9Ns3hOE0/ATNILNzv1S8hH/y77svRe7wVA/Nh+B3JsHEl1d7C7wBVnP3CAPhFh0QqJVhMiFdADk+PJ4uqClDb8BX+es68UAvqVxGx1upmqRezTWRMzTYo= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--surenb.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=O9tRS26q; arc=none smtp.client-ip=209.85.128.202 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--surenb.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="O9tRS26q" Received: by mail-yw1-f202.google.com with SMTP id 00721157ae682-604ad18981eso84791057b3.2 for ; Mon, 12 Feb 2024 13:40:47 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1707774046; x=1708378846; darn=vger.kernel.org; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=RjVDAYkVgDU7fuXLh0MJZ7V+qIVlVtuXoydpki6LzsY=; b=O9tRS26qal1HZMYF7ammvgw/ywiDw8AWm6PPmTg7HW+iCa8bKyQFxuy6KXdWeUcYzy bKFqD79XbbclStxC6/b433r+dYqlqMq6QXHUhC1xqYNIVxywCa9BQt/t3/zx/W4qZgEH stLvOkNtGbOW6aMLoPW3omgezI5IpAtafmuz7IqHUeups2ywSisXDVTBGJmxeR8klh/L b6L85WxEkPy38PiADRrcjJRNXPQG3RE8JWRpCClI41FQefQW2i9NaGaZIUHiGKh6lMyE ytjf5peUUN3WV46bH7MdREZA3cCjp/R7BWpRlcSOcD8dhSzRI9LqsX46wylLx1upKa95 x/Rw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1707774046; x=1708378846; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=RjVDAYkVgDU7fuXLh0MJZ7V+qIVlVtuXoydpki6LzsY=; b=cLU+9/sIsF9JMpxChB4fTvkuKClux9ZyvASsax2z5aYrUiCA9wjEKRaOt7ZviEulmr 6z6P/bpa6A80Xw7MGaY1GFnxbiJ72yUqJS+JhhqE2+pXYPucvYuO3tQSJ1+x+WBUHNPR MLXMarq2tg6Hq1dP1/EHg+KsXSGL0+E8QErcqE2rFdfpfD2kl1kbZpNHVbPevtXiTkZz QghESiQuhAa+GN1wg9olQPBaZRbw3+kGD7OuHKBWUNvqDSkVIXNCfulmpbjCGFBGW3Mx Nl9AFFtGm6KK1iCD+ZG4C50FPpUT1VU3JTk3+0bd73rsNMa2cTKAEdHRzhswVgA6rV3F Gn1g== X-Forwarded-Encrypted: i=1; AJvYcCXT3yqs1D/zp7beqCxsuYZtRsA2Z06DmNnKDq20Tt6L5TtErnDjONj9ES2VTmozPSx78LSOZtAouKMeRgY+6q1uuqIEe0egcwxlXG5Njw== X-Gm-Message-State: AOJu0YzBTPOp1ua3sx+Lx2l/v43OGG405AfS90aj2h2FLh0BpLFinbRv fRCvJsLzeaQltCBTHMjmy964iyKV0bfr7rB7zJsmUg8dtkR4gCCTJV0t1drBS/L3MU7XpMJnaqv cpw== X-Google-Smtp-Source: AGHT+IESoh+UWKTP+1hXTVbYaUvPuidDpjnUl+NYldJf9cgWEgRiy1LGQkGWPWQFR+H7vya0ViMEzA6ILJE= X-Received: from surenb-desktop.mtv.corp.google.com ([2620:15c:211:201:b848:2b3f:be49:9cbc]) (user=surenb job=sendgmr) by 2002:a05:6902:150d:b0:dc6:d678:371d with SMTP id q13-20020a056902150d00b00dc6d678371dmr2278885ybu.3.1707774046204; Mon, 12 Feb 2024 13:40:46 -0800 (PST) Date: Mon, 12 Feb 2024 13:39:20 -0800 In-Reply-To: <20240212213922.783301-1-surenb@google.com> Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20240212213922.783301-1-surenb@google.com> X-Mailer: git-send-email 2.43.0.687.g38aa6559b0-goog Message-ID: <20240212213922.783301-35-surenb@google.com> Subject: [PATCH v3 34/35] codetag: debug: introduce OBJEXTS_ALLOC_FAIL to mark failed slab_ext allocations From: Suren Baghdasaryan To: akpm@linux-foundation.org Cc: kent.overstreet@linux.dev, mhocko@suse.com, vbabka@suse.cz, hannes@cmpxchg.org, roman.gushchin@linux.dev, mgorman@suse.de, dave@stgolabs.net, willy@infradead.org, liam.howlett@oracle.com, corbet@lwn.net, void@manifault.com, peterz@infradead.org, juri.lelli@redhat.com, catalin.marinas@arm.com, will@kernel.org, arnd@arndb.de, tglx@linutronix.de, mingo@redhat.com, dave.hansen@linux.intel.com, x86@kernel.org, peterx@redhat.com, david@redhat.com, axboe@kernel.dk, mcgrof@kernel.org, masahiroy@kernel.org, nathan@kernel.org, dennis@kernel.org, tj@kernel.org, muchun.song@linux.dev, rppt@kernel.org, paulmck@kernel.org, pasha.tatashin@soleen.com, yosryahmed@google.com, yuzhao@google.com, dhowells@redhat.com, hughd@google.com, andreyknvl@gmail.com, keescook@chromium.org, ndesaulniers@google.com, vvvvvv@google.com, gregkh@linuxfoundation.org, ebiggers@google.com, ytcoode@gmail.com, vincent.guittot@linaro.org, dietmar.eggemann@arm.com, rostedt@goodmis.org, bsegall@google.com, bristot@redhat.com, vschneid@redhat.com, cl@linux.com, penberg@kernel.org, iamjoonsoo.kim@lge.com, 42.hyeyoo@gmail.com, glider@google.com, elver@google.com, dvyukov@google.com, shakeelb@google.com, songmuchun@bytedance.com, jbaron@akamai.com, rientjes@google.com, minchan@google.com, kaleshsingh@google.com, surenb@google.com, kernel-team@android.com, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, iommu@lists.linux.dev, linux-arch@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-modules@vger.kernel.org, kasan-dev@googlegroups.com, cgroups@vger.kernel.org If slabobj_ext vector allocation for a slab object fails and later on it succeeds for another object in the same slab, the slabobj_ext for the original object will be NULL and will be flagged in case when CONFIG_MEM_ALLOC_PROFILING_DEBUG is enabled. Mark failed slabobj_ext vector allocations using a new objext_flags flag stored in the lower bits of slab->obj_exts. When new allocation succeeds it marks all tag references in the same slabobj_ext vector as empty to avoid warnings implemented by CONFIG_MEM_ALLOC_PROFILING_DEBUG checks. Signed-off-by: Suren Baghdasaryan --- include/linux/memcontrol.h | 4 +++- mm/slab.h | 25 +++++++++++++++++++++++++ mm/slab_common.c | 22 +++++++++++++++------- 3 files changed, 43 insertions(+), 8 deletions(-) diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h index 2b010316016c..f95241ca9052 100644 --- a/include/linux/memcontrol.h +++ b/include/linux/memcontrol.h @@ -365,8 +365,10 @@ enum page_memcg_data_flags { #endif /* CONFIG_MEMCG */ enum objext_flags { + /* slabobj_ext vector failed to allocate */ + OBJEXTS_ALLOC_FAIL = __FIRST_OBJEXT_FLAG, /* the next bit after the last actual flag */ - __NR_OBJEXTS_FLAGS = __FIRST_OBJEXT_FLAG, + __NR_OBJEXTS_FLAGS = (__FIRST_OBJEXT_FLAG << 1), }; #define OBJEXTS_FLAGS_MASK (__NR_OBJEXTS_FLAGS - 1) diff --git a/mm/slab.h b/mm/slab.h index cf332a839bf4..7bb3900f83ef 100644 --- a/mm/slab.h +++ b/mm/slab.h @@ -586,9 +586,34 @@ static inline void mark_objexts_empty(struct slabobj_ext *obj_exts) } } +static inline void mark_failed_objexts_alloc(struct slab *slab) +{ + slab->obj_exts = OBJEXTS_ALLOC_FAIL; +} + +static inline void handle_failed_objexts_alloc(unsigned long obj_exts, + struct slabobj_ext *vec, unsigned int objects) +{ + /* + * If vector previously failed to allocate then we have live + * objects with no tag reference. Mark all references in this + * vector as empty to avoid warnings later on. + */ + if (obj_exts & OBJEXTS_ALLOC_FAIL) { + unsigned int i; + + for (i = 0; i < objects; i++) + set_codetag_empty(&vec[i].ref); + } +} + + #else /* CONFIG_MEM_ALLOC_PROFILING_DEBUG */ static inline void mark_objexts_empty(struct slabobj_ext *obj_exts) {} +static inline void mark_failed_objexts_alloc(struct slab *slab) {} +static inline void handle_failed_objexts_alloc(unsigned long obj_exts, + struct slabobj_ext *vec, unsigned int objects) {} #endif /* CONFIG_MEM_ALLOC_PROFILING_DEBUG */ diff --git a/mm/slab_common.c b/mm/slab_common.c index d5f75d04ced2..489c7a8ba8f1 100644 --- a/mm/slab_common.c +++ b/mm/slab_common.c @@ -214,29 +214,37 @@ int alloc_slab_obj_exts(struct slab *slab, struct kmem_cache *s, gfp_t gfp, bool new_slab) { unsigned int objects = objs_per_slab(s, slab); - unsigned long obj_exts; - void *vec; + unsigned long new_exts; + unsigned long old_exts; + struct slabobj_ext *vec; gfp &= ~OBJCGS_CLEAR_MASK; /* Prevent recursive extension vector allocation */ gfp |= __GFP_NO_OBJ_EXT; vec = kcalloc_node(objects, sizeof(struct slabobj_ext), gfp, slab_nid(slab)); - if (!vec) + if (!vec) { + /* Mark vectors which failed to allocate */ + if (new_slab) + mark_failed_objexts_alloc(slab); + return -ENOMEM; + } - obj_exts = (unsigned long)vec; + new_exts = (unsigned long)vec; #ifdef CONFIG_MEMCG - obj_exts |= MEMCG_DATA_OBJEXTS; + new_exts |= MEMCG_DATA_OBJEXTS; #endif + old_exts = slab->obj_exts; + handle_failed_objexts_alloc(old_exts, vec, objects); if (new_slab) { /* * If the slab is brand new and nobody can yet access its * obj_exts, no synchronization is required and obj_exts can * be simply assigned. */ - slab->obj_exts = obj_exts; - } else if (cmpxchg(&slab->obj_exts, 0, obj_exts)) { + slab->obj_exts = new_exts; + } else if (cmpxchg(&slab->obj_exts, old_exts, new_exts) != old_exts) { /* * If the slab is already in use, somebody can allocate and * assign slabobj_exts in parallel. In this case the existing