- 29 Apr, 2022 40 commits
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Miaohe Lin authored
Patch series "A few cleanup patches for z3fold", v2. This series contains a few patches to simplify the code, remove unneeded code, fix obsolete comment and so on. More details can be found in the respective changelogs. This patch (of 8): z3fold_mount is only called during init. So we should declare it with __init. Link: https://lkml.kernel.org/r/20220308134311.59086-1-linmiaohe@huawei.com Link: https://lkml.kernel.org/r/20220308134311.59086-2-linmiaohe@huawei.comSigned-off-by:
Miaohe Lin <linmiaohe@huawei.com> Reviewed-by:
Vitaly Wool <vitaly.wool@konsulko.com> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org>
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Xianting Tian authored
pte_page() always returns a valid page, so remove the redundant page validation, as we did in many other places. Link: https://lkml.kernel.org/r/20220316025947.328276-1-xianting.tian@linux.alibaba.comSigned-off-by:
Xianting Tian <xianting.tian@linux.alibaba.com> Reviewed-by:
Chaitanya Kulkarni <kch@nvidia.com> Cc: Alexey Dobriyan <adobriyan@gmail.com> Cc: Yang Shi <shy828301@gmail.com> Cc: Sasha Levin <sashal@kernel.org> Cc: Miaohe Lin <linmiaohe@huawei.com> Signed-off-by:
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Miaohe Lin authored
Since commit 791b48b6 ("mm: vmscan: scan until it finds eligible pages"), splicing any skipped pages to the tail of the LRU list won't put the system at risk of premature OOM but will waste lots of cpu cycles. Correct the comment accordingly. Link: https://lkml.kernel.org/r/20220416025231.8082-1-linmiaohe@huawei.comSigned-off-by:
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Miaohe Lin authored
Since commit 6d6435811c19 ("remove bdi_congested() and wb_congested() and related functions"), there is no congested backing device check anymore. Correct the comment accordingly. [akpm@linux-foundation.org: tweak grammar] Link: https://lkml.kernel.org/r/20220414120202.30082-1-linmiaohe@huawei.comSigned-off-by: -
Miaohe Lin authored
Since commit 1431d4d1 ("mm: base LRU balancing on an explicit cost model"), the relative value of each set of LRU lists is based on cost model instead of rotated/scanned ratio. Cleanup the relevant comment. Link: https://lkml.kernel.org/r/20220409030245.61211-1-linmiaohe@huawei.comSigned-off-by:
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Wei Yang authored
lruvec_lru_size() is only used in get_scan_count(), so the only possible zone_idx is sc->reclaim_idx. Since sc->reclaim_idx is ensured to be a valid zone idex, we can remove the extra check for zone iteration. Link: https://lkml.kernel.org/r/20220317234624.23358-1-richard.weiyang@gmail.comSigned-off-by:
Wei Yang <richard.weiyang@gmail.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Signed-off-by:
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Wei Yang authored
wakeup_kswapd() only wake up kswapd when the zone is managed. For two callers of wakeup_kswapd(), they are node perspective. * wake_all_kswapds * numamigrate_isolate_page If we picked up a !managed zone, this is not we expected. This patch makes sure we pick up a managed zone for wakeup_kswapd(). And it also use managed_zone in migrate_balanced_pgdat() to get the proper zone. [richard.weiyang@gmail.com: adjust the usage in migrate_balanced_pgdat()] Link: https://lkml.kernel.org/r/20220329010901.1654-2-richard.weiyang@gmail.com Link: https://lkml.kernel.org/r/20220327024101.10378-2-richard.weiyang@gmail.comSigned-off-by:
"Huang, Ying" <ying.huang@intel.com> Reviewed-by:
David Hildenbrand <david@redhat.com> Cc: Mel Gorman <mgorman@techsingularity.net> Cc: Oscar Salvador <osalvador@suse.de> Signed-off-by:
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Wei Yang authored
As mentioned in commit 6aa303de ("mm, vmscan: only allocate and reclaim from zones with pages managed by the buddy allocator") , reclaim only affects managed_zones. Let's adjust the code and comment accordingly. Link: https://lkml.kernel.org/r/20220327024101.10378-1-richard.weiyang@gmail.comSigned-off-by:
Oscar Salvador <osalvador@suse.de> Cc: "Huang, Ying" <ying.huang@intel.com> Cc: Mel Gorman <mgorman@techsingularity.net> Signed-off-by:
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Muchun Song authored
The feature of minimizing overhead of struct page associated with each HugeTLB page aims to free its vmemmap pages (used as struct page) to save memory, where is ~14GB/16GB per 1TB HugeTLB pages (2MB/1GB type). In short, when a HugeTLB page is allocated or freed, the vmemmap array representing the range associated with the page will need to be remapped. When a page is allocated, vmemmap pages are freed after remapping. When a page is freed, previously discarded vmemmap pages must be allocated before remapping. More implementations and details can be found here [1]. The infrastructure of freeing vmemmap pages associated with each HugeTLB page is already there, we can easily enable HUGETLB_PAGE_FREE_VMEMMAP for arm64, the only thing to be fixed is flush_dcache_page() . flush_dcache_page() need to be adapted to operate on the head page's flags since the tail vmemmap pages are mapped with read-only after the feature is enabled (clear operation is not permitted). There was some discussions about this in the thread [2], but there was no conclusion in the end. And I copied the concern proposed by Anshuman to here and explain why those concern is superfluous. It is safe to enable it for x86_64 as well as arm64. 1st concern: ''' But what happens when a hot remove section's vmemmap area (which is being teared down) is nearby another vmemmap area which is either created or being destroyed for HugeTLB alloc/free purpose. As you mentioned HugeTLB pages inside the hot remove section might be safe. But what about other HugeTLB areas whose vmemmap area shares page table entries with vmemmap entries for a section being hot removed ? Massive HugeTLB alloc /use/free test cycle using memory just adjacent to a memory hotplug area, which is always added and removed periodically, should be able to expose this problem. ''' Answer: At the time memory is removed, all HugeTLB pages either have been migrated away or dissolved. So there is no race between memory hot remove and free_huge_page_vmemmap(). Therefore, HugeTLB pages inside the hot remove section is safe. Let's talk your question "what about other HugeTLB areas whose vmemmap area shares page table entries with vmemmap entries for a section being hot removed ?", the question is not established. The minimal granularity size of hotplug memory 128MB (on arm64, 4k base page), any HugeTLB smaller than 128MB is within a section, then, there is no share PTE page tables between HugeTLB in this section and ones in other sections and a HugeTLB page could not cross two sections. In this case, the section cannot be freed. Any HugeTLB bigger than 128MB (section size) whose vmemmap pages is an integer multiple of 2MB (PMD-mapped). As long as: 1) HugeTLBs are naturally aligned, power-of-two sizes 2) The HugeTLB size >= the section size 3) The HugeTLB size >= the vmemmap leaf mapping size Then a HugeTLB will not share any leaf page table entries with *anything else*, but will share intermediate entries. In this case, at the time memory is removed, all HugeTLB pages either have been migrated away or dissolved. So there is also no race between memory hot remove and free_huge_page_vmemmap(). 2nd concern: ''' differently, not sure if ptdump would require any synchronization. Dumping an wrong value is probably okay but crashing because a page table entry is being freed after ptdump acquired the pointer is bad. On arm64, ptdump() is protected against hotremove via [get|put]_online_mems(). ''' Answer: The ptdump should be fine since vmemmap_remap_free() only exchanges PTEs or splits the PMD entry (which means allocating a PTE page table). Both operations do not free any page tables (PTE), so ptdump cannot run into a UAF on any page tables. The worst case is just dumping an wrong value. [1] https://lore.kernel.org/all/20210510030027.56044-1-songmuchun@bytedance.com/ [2] https://lore.kernel.org/all/20210518091826.36937-1-songmuchun@bytedance.com/ [songmuchun@bytedance.com: restructure the code comment inside flush_dcache_page()] Link: https://lkml.kernel.org/r/20220414072646.21910-1-songmuchun@bytedance.com Link: https://lkml.kernel.org/r/20220331065640.5777-2-songmuchun@bytedance.comSigned-off-by:
Muchun Song <songmuchun@bytedance.com> Reviewed-by:
Barry Song <baohua@kernel.org> Tested-by:
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Muchun Song authored
The feature of minimizing overhead of struct page associated with each HugeTLB page is implemented on x86_64, however, the infrastructure of this feature is already there, we could easily enable it for other architectures. Introduce ARCH_WANT_HUGETLB_PAGE_FREE_VMEMMAP for other architectures to be easily enabled. Just select this config if they want to enable this feature. Link: https://lkml.kernel.org/r/20220331065640.5777-1-songmuchun@bytedance.comSigned-off-by:
Anshuman Khandual <anshuman.khandual@arm.com> Cc: Bodeddula Balasubramaniam <bodeddub@amazon.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: David Hildenbrand <david@redhat.com> Cc: David Rientjes <rientjes@google.com> Cc: Fam Zheng <fam.zheng@bytedance.com> Cc: James Morse <james.morse@arm.com> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Mike Kravetz <mike.kravetz@oracle.com> Cc: Oscar Salvador <osalvador@suse.de> Cc: Will Deacon <will@kernel.org> Cc: Xiongchun Duan <duanxiongchun@bytedance.com> Signed-off-by:
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Jakob Koschel authored
In preparation to limit the scope of the list iterator to the list traversal loop, use a dedicated pointer to iterate through the list [1]. Before hugetlb_resv_map_add() was expecting a file_region struct, but in case the list iterator in add_reservation_in_range() did not exit early, the variable passed in, is not actually a valid structure. In such a case 'rg' is computed on the head element of the list and represents an out-of-bounds pointer. This still remains safe *iff* you only use the link member (as it is done in hugetlb_resv_map_add()). To avoid the type-confusion altogether and limit the list iterator to the loop, only a list_head pointer is kept to pass to hugetlb_resv_map_add(). Link: https://lore.kernel.org/all/CAHk-=wgRr_D8CB-D9Kg-c=EHreAsk5SqXPwr9Y7k9sA6cWXJ6w@mail.gmail.com/ [1] Link: https://lkml.kernel.org/r/20220331224323.903842-1-jakobkoschel@gmail.comSigned-off-by:
Jakob Koschel <jakobkoschel@gmail.com> Cc: Mike Kravetz <mike.kravetz@oracle.com> Cc: Mike Rapoport <rppt@kernel.org> Cc: "Brian Johannesmeyer" <bjohannesmeyer@gmail.com> Cc: Cristiano Giuffrida <c.giuffrida@vu.nl> Cc: "Bos, H.J." <h.j.bos@vu.nl> Cc: Jakob Koschel <jakobkoschel@gmail.com> Signed-off-by:
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Naoya Horiguchi authored
We know that HPageFreed pages should have page refcount 0, so get_page_unless_zero() always fails and returns 0. So explicitly separate the branch based on page state for minor optimization and better readability. Link: https://lkml.kernel.org/r/20220415041848.GA3034499@ik1-406-35019.vs.sakura.ne.jpSigned-off-by:
Naoya Horiguchi <naoya.horiguchi@nec.com> Suggested-by:
Mike Kravetz <mike.kravetz@oracle.com> Suggested-by:
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Miaohe Lin authored
If me_huge_page meets a truncated but not yet freed hugepage, it won't be dissolved even if we hold the last refcnt. It's because the hugepage has NULL page_mapping while it's not anonymous hugepage too. Thus we lose the last chance to dissolve it into buddy to save healthy subpages. Remove PageAnon check to handle these hugepages too. Link: https://lkml.kernel.org/r/20220414114941.11223-3-linmiaohe@huawei.comSigned-off-by:
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Miaohe Lin authored
Patch series "A few fixup and cleanup patches for memory failure", v2. This series contains a patch to clean up the HWPoisonHandlable and another one to dissolve truncated hugetlb page. More details can be found in the respective changelogs. This patch (of 2): The local variable movable can be removed by returning true directly. Also fix typo 'mirgate'. No functional change intended. Link: https://lkml.kernel.org/r/20220414114941.11223-1-linmiaohe@huawei.com Link: https://lkml.kernel.org/r/20220414114941.11223-2-linmiaohe@huawei.comSigned-off-by:
Yang Shi <shy828301@gmail.com> Acked-by:
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Naoya Horiguchi authored
Reverts commit 888af270 ("mm/memory-failure.c: fix race with changing page compound again") because now we fetch the page refcount under hugetlb_lock in try_memory_failure_hugetlb() so that the race check is no longer necessary. Link: https://lkml.kernel.org/r/20220408135323.1559401-4-naoya.horiguchi@linux.devSigned-off-by:
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Naoya Horiguchi authored
In already hwpoisoned case, memory_failure() is supposed to return with releasing the page refcount taken for error handling. But currently the refcount is not released when called with MF_COUNT_INCREASED, which makes page refcount inconsistent. This should be rare and non-critical, but it might be inconvenient in testing (unpoison doesn't work). Link: https://lkml.kernel.org/r/20220408135323.1559401-3-naoya.horiguchi@linux.devSigned-off-by:
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liqiong authored
No need cast (void*) to (struct hwp_walk*). Link: https://lkml.kernel.org/r/20220322142826.25939-1-liqiong@nfschina.comSigned-off-by:
liqiong <liqiong@nfschina.com> Acked-by:
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Zi Yan authored
Whenever the buddy of a page is found from __find_buddy_pfn(), page_is_buddy() should be used to check its validity. Add a helper function find_buddy_page_pfn() to find the buddy page and do the check together. [ziy@nvidia.com: updates per David] Link: https://lkml.kernel.org/r/20220401230804.1658207-2-zi.yan@sent.com Link: https://lore.kernel.org/linux-mm/CAHk-=wji_AmYygZMTsPMdJ7XksMt7kOur8oDfDdniBRMjm4VkQ@mail.gmail.com/ Link: https://lkml.kernel.org/r/7236E7CA-B5F1-4C04-AB85-E86FA3E9A54B@nvidia.comSuggested-by:
Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by:
Zi Yan <ziy@nvidia.com> Acked-by:
Vlastimil Babka <vbabka@suse.cz> Acked-by:
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Zi Yan authored
Move pageblock migratetype check code in the while loop to simplify the logic. It also saves redundant buddy page checking code. Link: https://lkml.kernel.org/r/20220401230804.1658207-1-zi.yan@sent.com Link: https://lore.kernel.org/linux-mm/27ff69f9-60c5-9e59-feb2-295250077551@suse.cz/Signed-off-by:
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Wei Yang authored
To make node order in round-robin in the same distance group, we add a penalty to the first node we got in each round. To get a round-robin order in the same distance group, we don't need to decrease the penalty since: * find_next_best_node() always iterates node in the same order * distance matters more then penalty in find_next_best_node() * in nodes with the same distance, the first one would be picked up So it is fine to increase same penalty when we get the first node in the same distance group. Since we just increase a constance of 1 to node penalty, it is not necessary to multiply MAX_NODE_LOAD for preference. [richard.weiyang@gmail.com: remove remove MAX_NODE_LOAD, per Vlastimil] Link: https://lkml.kernel.org/r/20220412001319.7462-1-richard.weiyang@gmail.com Link: https://lkml.kernel.org/r/20220123013537.20491-1-richard.weiyang@gmail.comSigned-off-by:
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Joel Savitz authored
commit 5ef64cc8 ("mm: allow a controlled amount of unfairness in the page lock") introduced a new systctl but no accompanying documentation. Add a simple entry to the documentation. Link: https://lkml.kernel.org/r/20220325164437.120246-1-jsavitz@redhat.comSigned-off-by:
Joel Savitz <jsavitz@redhat.com> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Vlastimil Babka <vbabka@suse.cz> Cc: Mel Gorman <mgorman@techsingularity.net> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: Suren Baghdasaryan <surenb@google.com> Cc: Mike Rapoport <rppt@kernel.org> Cc: "zhangyi (F)" <yi.zhang@huawei.com> Cc: Charan Teja Reddy <charante@codeaurora.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by:
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Yury Norov authored
vmap() takes struct page *pages as one of arguments, and user may provide an invalid pointer which may lead to corrupted translation table. An example of such behaviour is erroneous usage of virt_to_page(): vaddr1 = dma_alloc_coherent() page = virt_to_page() // Wrong here ... vaddr2 = vmap(page) memset(vaddr2) // Faulting here virt_to_page() returns a wrong pointer if vaddr1 is not a linear kernel address. The problem is that vmap() populates pte with bad pfn successfully, and it's much harder to debug at memory access time. This case should be caught by DEBUG_VIRTUAL being that enabled, but it's not enabled in popular distros. Kernel already checks the pages against NULL. In the case mentioned above, however, the address is not NULL, and it's big enough so that the hardware generated Address Size Abort on arm64: [ 665.484101] Unhandled fault at 0xffff8000252cd000 [ 665.488807] Mem abort info: [ 665.491617] ESR = 0x96000043 [ 665.494675] EC = 0x25: DABT (current EL), IL = 32 bits [ 665.499985] SET = 0, FnV = 0 [ 665.503039] EA = 0, S1PTW = 0 [ 665.506167] Data abort info: [ 665.509047] ISV = 0, ISS = 0x00000043 [ 665.512882] CM = 0, WnR = 1 [ 665.515851] swapper pgtable: 4k pages, 48-bit VAs, pgdp=00000000818cb000 [ 665.522550] [ffff8000252cd000] pgd=000000affcfff003, pud=000000affcffe003, pmd=0000008fad8c3003, pte=00688000a5217713 [ 665.533160] Internal error: level 3 address size fault: 96000043 [#1] SMP [ 665.539936] Modules linked in: [...] [ 665.616212] CPU: 178 PID: 13199 Comm: test Tainted: P OE 5.4.0-84-generic #94~18.04.1-Ubuntu [ 665.626806] Hardware name: HPE Apollo 70 /C01_APACHE_MB , BIOS L50_5.13_1.0.6 07/10/2018 [ 665.636618] pstate: 80400009 (Nzcv daif +PAN -UAO) [ 665.641407] pc : __memset+0x38/0x188 [ 665.645146] lr : test+0xcc/0x3f8 [ 665.650184] sp : ffff8000359bb840 [ 665.653486] x29: ffff8000359bb840 x28: 0000000000000000 [ 665.658785] x27: 0000000000000000 x26: 0000000000231000 [ 665.664083] x25: ffff00ae660f6110 x24: ffff00ae668cb800 [ 665.669382] x23: 0000000000000001 x22: ffff00af533e5000 [ 665.674680] x21: 0000000000001000 x20: 0000000000000000 [ 665.679978] x19: ffff00ae66950000 x18: ffffffffffffffff [ 665.685276] x17: 00000000588636a5 x16: 0000000000000013 [ 665.690574] x15: ffffffffffffffff x14: 000000000007ffff [ 665.695872] x13: 0000000080000000 x12: 0140000000000000 [ 665.701170] x11: 0000000000000041 x10: ffff8000652cd000 [ 665.706468] x9 : ffff8000252cf000 x8 : ffff8000252cd000 [ 665.711767] x7 : 0303030303030303 x6 : 0000000000001000 [ 665.717065] x5 : ffff8000252cd000 x4 : 0000000000000000 [ 665.722363] x3 : ffff8000252cdfff x2 : 0000000000000001 [ 665.727661] x1 : 0000000000000003 x0 : ffff8000252cd000 [ 665.732960] Call trace: [ 665.735395] __memset+0x38/0x188 [...] Interestingly, this abort happens even if copy_from_kernel_nofault() is used, which is quite inconvenient for debugging purposes. This patch adds a pfn_valid() check into vmap() path, so that invalid mapping will not be created; WARN_ON() is used to let client code know that something goes wrong, and it's not a regular EINVAL situation. Link: https://lkml.kernel.org/r/20220422220410.1308706-1-yury.norov@gmail.comSigned-off-by:
Yury Norov (NVIDIA) <yury.norov@gmail.com> Suggested-by:
Matthew Wilcox (Oracle) <willy@infradead.org> Cc: Alexey Klimov <aklimov@redhat.com> Cc: Anshuman Khandual <anshuman.khandual@arm.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Ding Tianhong <dingtianhong@huawei.com> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Nicholas Piggin <npiggin@gmail.com> Cc: Robin Murphy <robin.murphy@arm.com> Cc: Russell King <linux@armlinux.org.uk> Cc: Will Deacon <will@kernel.org> Signed-off-by:
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Yixuan Cao authored
The sentence "but the mempolcy want to alloc memory by interleaving" should be rephrased with "but the mempolicy wants to alloc memory by interleaving" where "mempolicy" is a struct name. This work is coauthored by Yinan Zhang Jiajian Ye Shenghong Han Chongxi Zhao Yuhong Feng Yongqiang Liu Link: https://lkml.kernel.org/r/20220401064543.4447-1-caoyixuan2019@email.szu.edu.cnSigned-off-by:
Yixuan Cao <caoyixuan2019@email.szu.edu.cn> Signed-off-by:
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Lu Jialin authored
There is no use for the private value, __OOM_TYPE and OOM notifier OOM_CONTROL. Therefore remove them to make the code clean. Link: https://lkml.kernel.org/r/20220421122755.40899-1-lujialin4@huawei.comSigned-off-by:
Lu Jialin <lujialin4@huawei.com> Acked-by:
Johannes Weiner <hannes@cmpxchg.org> Acked-by:
Shakeel Butt <shakeelb@google.com> Acked-by:
Roman Gushchin <roman.gushchin@linux.dev> Cc: Michal Hocko <mhocko@suse.com> Signed-off-by:
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Lu Jialin authored
cgroup_memory_noswap is only used in mm/memcontrol.c, therefore just make it static, and remove export in include/linux/memcontrol.h Link: https://lkml.kernel.org/r/20220421124736.62180-1-lujialin4@huawei.comSigned-off-by:
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Roman Gushchin authored
List memory control and kernel memory control kselftests in the memory resource controller entry. Link: https://lkml.kernel.org/r/20220415000133.3955987-5-roman.gushchin@linux.devSigned-off-by:
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Roman Gushchin authored
List cgroup kselftests in the cgroup MAINTAINERS entry. These are tests covering core, freezer and cgroup.kill functionality. Link: https://lkml.kernel.org/r/20220415000133.3955987-4-roman.gushchin@linux.devSigned-off-by:
Tejun Heo <tj@kernel.org> Cc: Zefan Li <lizefan.x@bytedance.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Chris Down <chris@chrisdown.name> Cc: David Vernet <void@manifault.com> Cc: Michal Hocko <mhocko@kernel.org> Cc: Shakeel Butt <shakeelb@google.com> Signed-off-by:
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Roman Gushchin authored
After commit 0e4b01df ("mm, memcg: throttle allocators when failing reclaim over memory.high") allocating memory over memory.high became very time consuming. But it's exactly what the memory.high test from cgroup kselftests is doing: it tries to allocate 100M with 30M memory.high value. It takes forever to complete. In order to keep it passing (or failing) in a reasonable amount of time let's try to allocate only a little over 30M: 31M to be precise. With this change test_memcontrol finishes in a reasonable amount of time: $ time ./test_memcontrol ok 1 test_memcg_subtree_control ok 2 test_memcg_current ok 3 test_memcg_min ok 4 test_memcg_low ok 5 test_memcg_high ok 6 test_memcg_max ok 7 test_memcg_oom_events ok 8 test_memcg_swap_max ok 9 test_memcg_sock ok 10 test_memcg_oom_group_leaf_events ok 11 test_memcg_oom_group_parent_events ok 12 test_memcg_oom_group_score_events real 0m2.273s user 0m0.064s sys 0m0.739s Link: https://lkml.kernel.org/r/20220415000133.3955987-3-roman.gushchin@linux.devSigned-off-by:
David Vernet <void@manifault.com> Cc: Chris Down <chris@chrisdown.name> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Michal Hocko <mhocko@kernel.org> Cc: Shakeel Butt <shakeelb@google.com> Cc: Tejun Heo <tj@kernel.org> Cc: Zefan Li <lizefan.x@bytedance.com> Signed-off-by:
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Roman Gushchin authored
Patch series "mm: memcg kselftests fixes". This patch (of 4): Commit 9852ae3f ("mm, memcg: consider subtrees in memory.events") made memory.events recursive: all events are propagated upwards by the tree. It was a change in semantics. It broke the oom group leaf events test: it assumes that after an OOM the oom_kill counter is zero on parent's level. Let's adjust the test: it should have similar expectations for the child and parent levels. The test passes after this fix. Link: https://lkml.kernel.org/r/20220415000133.3955987-2-roman.gushchin@linux.dev Link: https://lkml.kernel.org/r/20220415000133.3955987-1-roman.gushchin@linux.devSigned-off-by:
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Wei Yang authored
After commit bef8620c ("mm: memcg: deprecate the non-hierarchical mode"), we won't have a NULL parent except root_mem_cgroup. And this case is handled when (memcg == root). Link: https://lkml.kernel.org/r/20220403020833.26164-1-richard.weiyang@gmail.comSigned-off-by:
Michal Hocko <mhocko@suse.com> Reviewed-by:
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Wei Yang authored
For each round-trip, we assign generation on first invocation and compare it on subsequent invocations. Let's move them together to make it more self-explaining. Also this reduce a check on prev. [hannes@cmpxchg.org: better comment to explain reclaim model] Link: https://lkml.kernel.org/r/20220330234719.18340-4-richard.weiyang@gmail.comSigned-off-by:
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Wei Yang authored
During mem_cgroup_iter, there are two ways to get iteration position: reclaim vs non-reclaim mode. Let's do it explicitly for reclaim vs non-reclaim mode. Link: https://lkml.kernel.org/r/20220330234719.18340-3-richard.weiyang@gmail.comSigned-off-by:
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Wei Yang authored
Patch series "mm/memcg: some cleanup for mem_cgroup_iter()", v2. No functional change, try to make it more readable. This patch (of 3): Instead of resetting memcg when css is either not verified or not got reference, we can set it after these process. No functional change, just simplified the code a little. Link: https://lkml.kernel.org/r/20220330234719.18340-1-richard.weiyang@gmail.com Link: https://lkml.kernel.org/r/20220330234719.18340-2-richard.weiyang@gmail.comSigned-off-by:
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Wei Yang authored
When mz is not NULL, it means mz can either come from mem_cgroup_largest_soft_limit_node or __mem_cgroup_largest_soft_limit_node. And both of them have removed this node by __mem_cgroup_remove_exceeded(). Not necessary to call __mem_cgroup_remove_exceeded() again. [mhocko@suse.com: refine changelog] Link: https://lkml.kernel.org/r/20220314233030.12334-1-richard.weiyang@gmail.comSigned-off-by:
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Miaohe Lin authored
The local variable nr_scanned is unneeded as mem_cgroup_soft_reclaim always does *total_scanned += nr_scanned. So we can pass total_scanned directly to the mem_cgroup_soft_reclaim to simplify the code and save some cpu cycles of adding nr_scanned to total_scanned. Link: https://lkml.kernel.org/r/20220328114144.53389-1-linmiaohe@huawei.comSigned-off-by:
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Miaohe Lin authored
The return value of shmem_init is never used. So we can make it return void now. [akpm@linux-foundation.org: remove `return;' from void-returning function, per Muchun Song] Link: https://lkml.kernel.org/r/20220328112707.22217-1-linmiaohe@huawei.comSigned-off-by:
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Chen Wandun authored
In function bdi_set_min_ratio, min_ratio is unsigned int, it will result underflow when setting min_ratio below bdi->min_ratio, it is confusing. Rework it, no functional change. Link: https://lkml.kernel.org/r/20220422095159.2858305-1-chenwandun@huawei.comSigned-off-by:
Chen Wandun <chenwandun@huawei.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Jens Axboe <axboe@kernel.dk> Signed-off-by:
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Yixuan Cao authored
I noticed a detail that needs to be adjusted. When judging whether a page is allocated by vmalloc, the value of the variable "tmp" was repeatedly judged, so the code was adjusted. This work is coauthored by Yinan Zhang, Jiajian Ye, Shenghong Han, Chongxi Zhao, Yuhong Feng and Yongqiang Liu. Link: https://lkml.kernel.org/r/20220414042744.13896-1-caoyixuan2019@email.szu.edu.cnSigned-off-by:
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Yixuan Cao authored
An application is suspected of having memory leak when its memory consumption is high and keeps increasing. There are several commonly used memory allocators: slab, cma, vmalloc, etc. The memory leak identification can be sped up if the page information allocated by an allocator can be analyzed separately. This patch provides supports for memory allocator labelling for slab, vmalloc, and cma. The pages allocated by slab and cma can be confirmed from the "PFN" line according to the kernel codes, and the label of the vmalloc allocator can be obtained by analyzing the stack trace. Thanks for Vlastimil Babka's constructive suggestions. Based on Yinan Zhang's study, the call chain of vmalloc() is vmalloc() -> ... -> __vmalloc_node_range() -> __vmalloc_area_node(). __vmalloc_area_node() requests memory through the interface of buddy allocation system. In the current version, __vmalloc_area_node() uses four interfaces: alloc_pages_bulk_array_mempolicy(), alloc_pages_bulk_array_node(), alloc_pages() and alloc_pages_node(). By disassembling the code, we find that __vmalloc_area_node() is expanded in __vmalloc_node_range(). So __vmalloc_area_node is not in the stack trace. On the test machine, the stack trace of pages allocated by vmalloc has the following four forms: __alloc_pages_bulk+0x230/0x6a0 __vmalloc_node_range+0x19c/0x598 alloc_pages_bulk_array_mempolicy+0xbc/0x278 __vmalloc_node_range+0x1e8/0x598 __alloc_pages+0x160/0x2b0 __vmalloc_node_range+0x234/0x598 alloc_pages+0xac/0x150 __vmalloc_node_range+0x44c/0x598 Therefore, in two consecutive lines of stacktrace, if the first line contains the word "alloc_pages" and the second line contains the word "__vmalloc_node_range", it can be determined that the page is allocated by vmalloc. And the function offset and size are not the same on different machines, so there is no need to match them. At the same time, this patch updates the --cull and --sort options to support allocator-based merge statistics and sorting. The added functions are fully compatible with the original work. When using, you can use "allocator", or abbreviated as "ator". Relevant updates have also been made in the documentation(Documentation/vm/page_owner.rst). Example: ./page_owner_sort <input> <output> --cull=st,pid,name,allocator ./page_owner_sort <input> <output> --sort=ator,pid,name This work is coauthored by Jiajian Ye, Yinan Zhang, Shenghong Han, Chongxi Zhao, Yuhong Feng and Yongqiang Liu. Link: https://lkml.kernel.org/r/20220410132932.9402-1-caoyixuan2019@email.szu.edu.cnSigned-off-by:
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Haowen Bai authored
As normal usage, tool will print huge parser log and spend a lot of time printing, so it would be preferable add "-d" debug control to avoid this problem. Link: https://lkml.kernel.org/r/1649672446-5685-1-git-send-email-baihaowen@meizu.comSigned-off-by:
Haowen Bai <baihaowen@meizu.com> Cc: Chongxi Zhao <zhaochongxi2019@email.szu.edu.cn> Cc: Jiajian Ye <yejiajian2018@email.szu.edu.cn> Cc: Shenghong Han <hanshenghong2019@email.szu.edu.cn> Cc: Yinan Zhang <zhangyinan2019@email.szu.edu.cn> Cc: Yixuan Cao <caoyixuan2019@email.szu.edu.cn> Cc: Yongqiang Liu <liuyongqiang13@huawei.com> Cc: Yuhong Feng <yuhongf@szu.edu.cn> Cc: Sean Anderson <seanga2@gmail.com> Signed-off-by:
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