From patchwork Tue May 21 11:18:39 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Jason A. Donenfeld" X-Patchwork-Id: 13669318 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id C080EC25B74 for ; Tue, 21 May 2024 11:20:25 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 3F8246B009B; Tue, 21 May 2024 07:20:25 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 3A8AB6B00A0; Tue, 21 May 2024 07:20:25 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 2710C6B00A3; Tue, 21 May 2024 07:20:25 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0014.hostedemail.com [216.40.44.14]) by kanga.kvack.org (Postfix) with ESMTP id 0527A6B009B for ; Tue, 21 May 2024 07:20:24 -0400 (EDT) Received: from smtpin13.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay10.hostedemail.com (Postfix) with ESMTP id 2D4DAC0F67 for ; Tue, 21 May 2024 11:20:24 +0000 (UTC) X-FDA: 82142159568.13.B364DAE Received: from sin.source.kernel.org (sin.source.kernel.org [145.40.73.55]) by imf22.hostedemail.com (Postfix) with ESMTP id B6685C0007 for ; Tue, 21 May 2024 11:20:20 +0000 (UTC) Authentication-Results: imf22.hostedemail.com; dkim=pass header.d=zx2c4.com header.s=20210105 header.b=bgwT2yv8; dmarc=pass (policy=quarantine) header.from=zx2c4.com; spf=pass (imf22.hostedemail.com: domain of "SRS0=wnTG=MY=zx2c4.com=Jason@kernel.org" designates 145.40.73.55 as permitted sender) smtp.mailfrom="SRS0=wnTG=MY=zx2c4.com=Jason@kernel.org" ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1716290421; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=Lxzim5GhjfMbwcsC+WCZ0jlmB8ZMyjGe5NZ2XpurpiI=; b=0dpV+mhFyS1xvhluSKkz6JsqSK2is2qq/yWJfndRqZ6agA7BnN9aDmppX8Pf9C2y9BSVtX 3v7YQRA8EiSzU2rnFzikDMZSfeaBesn8PSd3PEzvYje0vv5fn1OAXbUIevXPCX54L+rEFF woLOsl9/lozQbu6ggQiPumE7F+VVIVc= ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1716290421; a=rsa-sha256; cv=none; b=2uvDmquXxJo8W4a8DJljF73TQ35oTg3+1NNfozNHsMZpbv+v6xujSp3yXaYvfuW7EtwLwb w0bcAr7RDegKmC1Ts1bZbMZ9v1MivG7Pu3LMMLt2V9Du9sJJTUCHpeljpHhNUKIlzZS988 fgcq6gIvIUMy9W88Wx2GzeNuETwzilo= ARC-Authentication-Results: i=1; imf22.hostedemail.com; dkim=pass header.d=zx2c4.com header.s=20210105 header.b=bgwT2yv8; dmarc=pass (policy=quarantine) header.from=zx2c4.com; spf=pass (imf22.hostedemail.com: domain of "SRS0=wnTG=MY=zx2c4.com=Jason@kernel.org" designates 145.40.73.55 as permitted sender) smtp.mailfrom="SRS0=wnTG=MY=zx2c4.com=Jason@kernel.org" Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by sin.source.kernel.org (Postfix) with ESMTP id 0EFDECE0EF6; Tue, 21 May 2024 11:20:16 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id B6968C4AF09; Tue, 21 May 2024 11:20:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=zx2c4.com; s=20210105; t=1716290414; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=Lxzim5GhjfMbwcsC+WCZ0jlmB8ZMyjGe5NZ2XpurpiI=; b=bgwT2yv8YYhweiaAc2IevN6C86YXSuRM78t44zN4P4eKFnvtSPknVuJMxKsq9hqrWB+dRj UbcXYP8RbR6DqMhvB6/wxa8bB7VoT11+2ZF8SlsLIksQj1uwkEPt/rqV+3k8/Wt5KlWzMn Kin+djEFNkDlZdjfteE4A8QXFE/GcBM= Received: by mail.zx2c4.com (ZX2C4 Mail Server) with ESMTPSA id dcf33978 (TLSv1.3:TLS_AES_256_GCM_SHA384:256:NO); Tue, 21 May 2024 11:20:13 +0000 (UTC) From: "Jason A. Donenfeld" To: linux-kernel@vger.kernel.org, patches@lists.linux.dev, tglx@linutronix.de Cc: "Jason A. Donenfeld" , linux-mm@kvack.org Subject: [PATCH v15 1/5] mm: add VM_DROPPABLE for designating always lazily freeable mappings Date: Tue, 21 May 2024 13:18:39 +0200 Message-ID: <20240521111958.2384173-2-Jason@zx2c4.com> In-Reply-To: <20240521111958.2384173-1-Jason@zx2c4.com> References: <20240521111958.2384173-1-Jason@zx2c4.com> MIME-Version: 1.0 X-Stat-Signature: 4e6qmjgayrw5zxbaxbjazueuthojjmb3 X-Rspamd-Queue-Id: B6685C0007 X-Rspam-User: X-Rspamd-Server: rspam01 X-HE-Tag: 1716290420-489735 X-HE-Meta: U2FsdGVkX1/pwMyMIjKtJI78sPA3dB9BLSLROz7h0fPfuuQOmwA4nltWTma8DvZSFkKhBDP/D8eCeBZvv0q1sTZ9xAjVB1KcuU/F387jRpCfcUFax16ELDjMSdolUoWWeIaagpCbtB+/fjuVo5Z4FRhimAFBClOlISOWlCRxCCG3qT2C9GpGkrUZtATz9w54soJ2JuWQCpPb01XEc7EOKkIgxpvfpPVe1gRmoXRm9OtY/Bvt65mHu/O0L5LnQqgOaUo86tmwNQ/EwPX+vyIio4iTLqUcg37YyYjypobEyolvo5M5kJFTT4lXSaOsoEWNgJ0VoGi6A2n/ZB21vd5sBqTv+ILfN0ttz7u4q6gRN3DT7Hx7mU2eYcxRnD0O9IJNfbNRnTB7SKiav8dweZFDdRcpS2n7W1/LyXVk6JgSMlVINaxBLoEsQ86QDmdnL0sY0cgc6GdynDSjTrLAPT3ZnvS65s9I09PoZi7L1LDQ2poz1/CpVdgoIG2oXcdjuPL6EfOR3rMQ0yr42MEiZXoRkqPN1LlPJQIVLXA6L8XcmAQO6uMmNTeq15OOKsRMqXxw5Jr9PT+XCxwhbV/Tc/x486muw/eAMUq7HwPWSrEV17x6xMVZ8FhIV6yMitIDCl3bWqVusHem/fF5A7Fd8Le+HzjhhIWHsrmivdBuWcsx3hhBKfGU9eQO2BPOVPqOo/Eia036jQD+dpHOPXtu8W7+N+USyFj0j6VrrAhXhUg6Hf/Fq8DC0FZmqCtQ6EL/Y5jcUvFvxWy1yH5oVUEbXt7uMJ43TagKz2OzVg+EzuhKSblKlNa6aa7q7NKOyZKG4BMRIgEq1chOYGt4oj4NytLpVN5peVUjj+HI48+s4r4jXNGJ6Rq50DqNBpGo+OrFMcj4jAP0XiGMe7isSvVJeTePXvTF/jnzU1FA3ztZhe0gtbcrjGHXMLwVITH8/h927l9j7UHrCwB8/OHaHU4gmlQ T4MvzOnO 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 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: List-Subscribe: List-Unsubscribe: The vDSO getrandom() implementation works with a buffer allocated with a new system call that has certain requirements: - It shouldn't be written to core dumps. * Easy: VM_DONTDUMP. - It should be zeroed on fork. * Easy: VM_WIPEONFORK. - It shouldn't be written to swap. * Uh-oh: mlock is rlimited. * Uh-oh: mlock isn't inherited by forks. - It shouldn't reserve actual memory, but it also shouldn't crash when page faulting in memory if none is available * Uh-oh: MAP_NORESERVE respects vm.overcommit_memory=2. * Uh-oh: VM_NORESERVE means segfaults. It turns out that the vDSO getrandom() function has three really nice characteristics that we can exploit to solve this problem: 1) Due to being wiped during fork(), the vDSO code is already robust to having the contents of the pages it reads zeroed out midway through the function's execution. 2) In the absolute worst case of whatever contingency we're coding for, we have the option to fallback to the getrandom() syscall, and everything is fine. 3) The buffers the function uses are only ever useful for a maximum of 60 seconds -- a sort of cache, rather than a long term allocation. These characteristics mean that we can introduce VM_DROPPABLE, which has the following semantics: a) It never is written out to swap. b) Under memory pressure, mm can just drop the pages (so that they're zero when read back again). c) If there's not enough memory to service a page fault, it's not fatal. d) It is inherited by fork. e) It doesn't count against the mlock budget, since nothing is locked. This is fairly simple to implement, with the one snag that we have to use 64-bit VM_* flags, but this shouldn't be a problem, since the only consumers will probably be 64-bit anyway. This way, allocations used by vDSO getrandom() can use: VM_DROPPABLE | VM_DONTDUMP | VM_WIPEONFORK | VM_NORESERVE And there will be no problem with OOMing, crashing on overcommitment, using memory when not in use, not wiping on fork(), coredumps, or writing out to swap. Cc: linux-mm@kvack.org Signed-off-by: Jason A. Donenfeld --- fs/proc/task_mmu.c | 3 +++ include/linux/mm.h | 8 ++++++++ include/trace/events/mmflags.h | 7 +++++++ mm/Kconfig | 3 +++ mm/memory.c | 4 ++++ mm/mempolicy.c | 3 +++ mm/mprotect.c | 2 +- mm/rmap.c | 5 +++-- 8 files changed, 32 insertions(+), 3 deletions(-) diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c index e5a5f015ff03..b5a59e57bde1 100644 --- a/fs/proc/task_mmu.c +++ b/fs/proc/task_mmu.c @@ -706,6 +706,9 @@ static void show_smap_vma_flags(struct seq_file *m, struct vm_area_struct *vma) #endif /* CONFIG_HAVE_ARCH_USERFAULTFD_MINOR */ #ifdef CONFIG_X86_USER_SHADOW_STACK [ilog2(VM_SHADOW_STACK)] = "ss", +#endif +#ifdef CONFIG_NEED_VM_DROPPABLE + [ilog2(VM_DROPPABLE)] = "dp", #endif }; size_t i; diff --git a/include/linux/mm.h b/include/linux/mm.h index 9849dfda44d4..5978cb4cc21c 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -321,12 +321,14 @@ extern unsigned int kobjsize(const void *objp); #define VM_HIGH_ARCH_BIT_3 35 /* bit only usable on 64-bit architectures */ #define VM_HIGH_ARCH_BIT_4 36 /* bit only usable on 64-bit architectures */ #define VM_HIGH_ARCH_BIT_5 37 /* bit only usable on 64-bit architectures */ +#define VM_HIGH_ARCH_BIT_6 38 /* bit only usable on 64-bit architectures */ #define VM_HIGH_ARCH_0 BIT(VM_HIGH_ARCH_BIT_0) #define VM_HIGH_ARCH_1 BIT(VM_HIGH_ARCH_BIT_1) #define VM_HIGH_ARCH_2 BIT(VM_HIGH_ARCH_BIT_2) #define VM_HIGH_ARCH_3 BIT(VM_HIGH_ARCH_BIT_3) #define VM_HIGH_ARCH_4 BIT(VM_HIGH_ARCH_BIT_4) #define VM_HIGH_ARCH_5 BIT(VM_HIGH_ARCH_BIT_5) +#define VM_HIGH_ARCH_6 BIT(VM_HIGH_ARCH_BIT_6) #endif /* CONFIG_ARCH_USES_HIGH_VMA_FLAGS */ #ifdef CONFIG_ARCH_HAS_PKEYS @@ -357,6 +359,12 @@ extern unsigned int kobjsize(const void *objp); # define VM_SHADOW_STACK VM_NONE #endif +#ifdef CONFIG_NEED_VM_DROPPABLE +# define VM_DROPPABLE VM_HIGH_ARCH_6 +#else +# define VM_DROPPABLE VM_NONE +#endif + #if defined(CONFIG_X86) # define VM_PAT VM_ARCH_1 /* PAT reserves whole VMA at once (x86) */ #elif defined(CONFIG_PPC) diff --git a/include/trace/events/mmflags.h b/include/trace/events/mmflags.h index e46d6e82765e..fab7848df50a 100644 --- a/include/trace/events/mmflags.h +++ b/include/trace/events/mmflags.h @@ -165,6 +165,12 @@ IF_HAVE_PG_ARCH_X(arch_3) # define IF_HAVE_UFFD_MINOR(flag, name) #endif +#ifdef CONFIG_NEED_VM_DROPPABLE +# define IF_HAVE_VM_DROPPABLE(flag, name) {flag, name}, +#else +# define IF_HAVE_VM_DROPPABLE(flag, name) +#endif + #define __def_vmaflag_names \ {VM_READ, "read" }, \ {VM_WRITE, "write" }, \ @@ -197,6 +203,7 @@ IF_HAVE_VM_SOFTDIRTY(VM_SOFTDIRTY, "softdirty" ) \ {VM_MIXEDMAP, "mixedmap" }, \ {VM_HUGEPAGE, "hugepage" }, \ {VM_NOHUGEPAGE, "nohugepage" }, \ +IF_HAVE_VM_DROPPABLE(VM_DROPPABLE, "droppable" ) \ {VM_MERGEABLE, "mergeable" } \ #define show_vma_flags(flags) \ diff --git a/mm/Kconfig b/mm/Kconfig index b4cb45255a54..6cd65ea4b3ad 100644 --- a/mm/Kconfig +++ b/mm/Kconfig @@ -1056,6 +1056,9 @@ config ARCH_USES_HIGH_VMA_FLAGS bool config ARCH_HAS_PKEYS bool +config NEED_VM_DROPPABLE + select ARCH_USES_HIGH_VMA_FLAGS + bool config ARCH_USES_PG_ARCH_X bool diff --git a/mm/memory.c b/mm/memory.c index b5453b86ec4b..57b03fc73159 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -5689,6 +5689,10 @@ vm_fault_t handle_mm_fault(struct vm_area_struct *vma, unsigned long address, lru_gen_exit_fault(); + /* If the mapping is droppable, then errors due to OOM aren't fatal. */ + if (vma->vm_flags & VM_DROPPABLE) + ret &= ~VM_FAULT_OOM; + if (flags & FAULT_FLAG_USER) { mem_cgroup_exit_user_fault(); /* diff --git a/mm/mempolicy.c b/mm/mempolicy.c index aec756ae5637..a66289f1d931 100644 --- a/mm/mempolicy.c +++ b/mm/mempolicy.c @@ -2300,6 +2300,9 @@ struct folio *vma_alloc_folio_noprof(gfp_t gfp, int order, struct vm_area_struct pgoff_t ilx; struct page *page; + if (vma->vm_flags & VM_DROPPABLE) + gfp |= __GFP_NOWARN | __GFP_NORETRY; + pol = get_vma_policy(vma, addr, order, &ilx); page = alloc_pages_mpol_noprof(gfp | __GFP_COMP, order, pol, ilx, numa_node_id()); diff --git a/mm/mprotect.c b/mm/mprotect.c index 94878c39ee32..88ff3ecc08a1 100644 --- a/mm/mprotect.c +++ b/mm/mprotect.c @@ -622,7 +622,7 @@ mprotect_fixup(struct vma_iterator *vmi, struct mmu_gather *tlb, may_expand_vm(mm, oldflags, nrpages)) return -ENOMEM; if (!(oldflags & (VM_ACCOUNT|VM_WRITE|VM_HUGETLB| - VM_SHARED|VM_NORESERVE))) { + VM_SHARED|VM_NORESERVE|VM_DROPPABLE))) { charged = nrpages; if (security_vm_enough_memory_mm(mm, charged)) return -ENOMEM; diff --git a/mm/rmap.c b/mm/rmap.c index e8fc5ecb59b2..f23b9f796aae 100644 --- a/mm/rmap.c +++ b/mm/rmap.c @@ -1397,7 +1397,8 @@ void folio_add_new_anon_rmap(struct folio *folio, struct vm_area_struct *vma, VM_WARN_ON_FOLIO(folio_test_hugetlb(folio), folio); VM_BUG_ON_VMA(address < vma->vm_start || address + (nr << PAGE_SHIFT) > vma->vm_end, vma); - __folio_set_swapbacked(folio); + if (!(vma->vm_flags & VM_DROPPABLE)) + __folio_set_swapbacked(folio); __folio_set_anon(folio, vma, address, true); if (likely(!folio_test_large(folio))) { @@ -1841,7 +1842,7 @@ static bool try_to_unmap_one(struct folio *folio, struct vm_area_struct *vma, * plus the rmap(s) (dropped by discard:). */ if (ref_count == 1 + map_count && - !folio_test_dirty(folio)) { + (!folio_test_dirty(folio) || (vma->vm_flags & VM_DROPPABLE))) { dec_mm_counter(mm, MM_ANONPAGES); goto discard; }