From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-yb0-f197.google.com (mail-yb0-f197.google.com [209.85.213.197]) by kanga.kvack.org (Postfix) with ESMTP id 411436B0038 for ; Thu, 27 Apr 2017 13:39:22 -0400 (EDT) Received: by mail-yb0-f197.google.com with SMTP id q2so14222006ybb.0 for ; Thu, 27 Apr 2017 10:39:22 -0700 (PDT) Received: from mail-qk0-x243.google.com (mail-qk0-x243.google.com. [2607:f8b0:400d:c09::243]) by mx.google.com with ESMTPS id 83si1311845ywc.7.2017.04.27.10.39.21 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 27 Apr 2017 10:39:21 -0700 (PDT) Received: by mail-qk0-x243.google.com with SMTP id a19so5725139qkg.2 for ; Thu, 27 Apr 2017 10:39:21 -0700 (PDT) From: Florian Fainelli Subject: [PATCH 0/3 v2] ARM/ARM64: silence large module first time allocation Date: Thu, 27 Apr 2017 10:38:57 -0700 Message-Id: <20170427173900.2538-1-f.fainelli@gmail.com> Sender: owner-linux-mm@kvack.org List-ID: To: linux-arm-kernel@lists.infradead.org Cc: Florian Fainelli , Russell King , Catalin Marinas , Will Deacon , Ard Biesheuvel , Andrew Morton , Michal Hocko , zijun_hu , "Kirill A. Shutemov" , Andrey Ryabinin , Chris Wilson , open list , "open list:MEMORY MANAGEMENT" , angus@angusclark.org With kernels built with CONFIG_ARM{,64}_MODULES_PLTS=y, the first allocation done from module space will fail, produce a general OOM allocation and also a vmap warning. The second allocation from vmalloc space may or may not be successful, but is actually the one we are interested about in these cases. This patch series passed __GFP_NOWARN to silence such allocations from the ARM/ARM64 module loader's first time allocation when the MODULES_PLT option is enabled, and also makes alloc_vmap_area() react to the caller setting __GFP_NOWARN to silence "vmap allocation for size..." messages. Changes in v2: - check __GFP_NOWARN out of the printk_ratelimited() check (Michal) Here is an example of what we would get without these two patches, pretty scary huh? # insmod /mnt/nfs/huge.ko [ 22.114143] random: nonblocking pool is initialized [ 22.183575] vmap allocation for size 15736832 failed: use vmalloc= to increase size. [ 22.191873] vmalloc: allocation failure: 15729534 bytes [ 22.197112] insmod: page allocation failure: order:0, mode:0xd0 [ 22.203048] CPU: 2 PID: 1506 Comm: insmod Tainted: G O 4.1.20-1.9pre-01082-gbbbff07bc3ce #9 [ 22.212536] Hardware name: Broadcom STB (Flattened Device Tree) [ 22.218480] [] (unwind_backtrace) from [] (show_stack+0x10/0x14) [ 22.226238] [] (show_stack) from [] (dump_stack+0x90/0xa4) [ 22.233473] [] (dump_stack) from [] (warn_alloc_failed+0x104/0x144) [ 22.241490] [] (warn_alloc_failed) from [] (__vmalloc_node_range+0x170/0x218) [ 22.250375] [] (__vmalloc_node_range) from [] (module_alloc+0x50/0xac) [ 22.258651] [] (module_alloc) from [] (module_alloc_update_bounds+0xc/0x6c) [ 22.267360] [] (module_alloc_update_bounds) from [] (load_module+0x8ec/0x2058) [ 22.276329] [] (load_module) from [] (SyS_init_module+0xf0/0x174) [ 22.284170] [] (SyS_init_module) from [] (ret_fast_syscall+0x0/0x3c) [ 22.292277] Mem-Info: [ 22.294567] active_anon:5236 inactive_anon:1773 isolated_anon:0 [ 22.294567] active_file:1 inactive_file:3822 isolated_file:0 [ 22.294567] unevictable:0 dirty:0 writeback:0 unstable:0 [ 22.294567] slab_reclaimable:238 slab_unreclaimable:1594 [ 22.294567] mapped:855 shmem:2950 pagetables:36 bounce:0 [ 22.294567] free:39031 free_pcp:198 free_cma:3928 [ 22.327196] DMA free:156124kB min:1880kB low:2348kB high:2820kB active_anon:20944kB inactive_anon:7092kB active_file:4kB inactive_file:15288kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:262144kB managed:227676kB mlocked:0kB dirty:0kB writeback:0kB mapped:3420kB shmem:11800kB slab_reclaimable:952kB slab_unreclaimable:6376kB kernel_stack:560kB pagetables:144kB unstable:0kB bounce:0kB free_pcp:792kB local_pcp:68kB free_cma:15712kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? no [ 22.371631] lowmem_reserve[]: 0 0 0 0 [ 22.375372] HighMem free:0kB min:128kB low:128kB high:128kB active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:2883584kB managed:0kB mlocked:0kB dirty:0kB writeback:0kB mapped:0kB shmem:0kB slab_reclaimable:0kB slab_unreclaimable:0kB kernel_stack:0kB pagetables:0kB unstable:0kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? yes [ 22.416249] lowmem_reserve[]: 0 0 0 0 [ 22.419986] DMA: 3*4kB (UEM) 4*8kB (UE) 1*16kB (M) 4*32kB (UEMC) 3*64kB (EMC) 1*128kB (E) 4*256kB (UEMC) 2*512kB (UE) 2*1024kB (MC) 4*2048kB (UEMC) 35*4096kB (MRC) = 156156kB [ 22.435922] HighMem: 0*4kB 0*8kB 0*16kB 0*32kB 0*64kB 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 0kB [ 22.446130] 6789 total pagecache pages [ 22.449889] 0 pages in swap cache [ 22.453212] Swap cache stats: add 0, delete 0, find 0/0 [ 22.458447] Free swap = 0kB [ 22.461334] Total swap = 0kB [ 22.464222] 786432 pages RAM [ 22.467110] 720896 pages HighMem/MovableOnly [ 22.471388] 725417 pages reserved [ 22.474711] 4096 pages cma reserved [ 22.511310] big_init: I am a big module using 3932160 bytes of data! Florian Fainelli (3): mm: Silence vmap() allocation failures based on caller gfp_flags ARM: Silence first allocation with CONFIG_ARM_MODULE_PLTS=y arm64: Silence first allocation with CONFIG_ARM64_MODULE_PLTS=y arch/arm/kernel/module.c | 11 +++++++++-- arch/arm64/kernel/module.c | 7 ++++++- mm/vmalloc.c | 2 +- 3 files changed, 16 insertions(+), 4 deletions(-) -- 2.9.3 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org