Thomas has noticed the following NULL ptr dereference when using cgroup v1 kmem limit: BUG: unable to handle kernel NULL pointer dereference at 0000000000000008 PGD 0 P4D 0 Oops: 0000 [#1] PREEMPT SMP PTI CPU: 3 PID: 16923 Comm: gtk-update-icon Not tainted 4.19.51 #42 Hardware name: ...
当memcg kmem功能被启用时,如果用户删除该memcg,内核内部某些结构数据仍会保留,这将导致系统在长时间运行后出现卡顿或内存不足等问题。 符合以下条件的系统会出现此问题。 Alibaba Cloud Linux 3(内核5.10.134-12.2之前版本)。 Alibaba Cloud Linux 2(内核4.19.91-26.6之前版本)。 其它主流...
memory.kmem.limit_in_bytes set/show hard limit for kernel memory 89+ This knob is deprecated and shouldn't be 90+ used. It is planned that this be removed in 91+ the foreseeable future. 9092 memory.kmem.usage_in_bytes show current kernel memory allocation ...
[24445.896416] memory+swap: usage81920kB, limit9007199254740988kB, failcnt0 [24445.896417] kmem: usage544kB, limit9007199254740988kB, failcnt0 [24445.896419] Memory cgroup statsfor/oom_test: [24445.896482] anon83329024 file0 kernel_stack65536 pagetables315392 percpu0 sock0 shmem0 file_mapped0 file_...
struct res_counter res; // mem统计变量 res_counter memsw; // mem+sw的和 struct res_counter kmem; // 内核内存统计量 ... } 这些参数的入口都在mm/memcontrol.c下,比如说memory.usage_in_bytes的读取调用的是mem_cgroup_read函数, 统计的入口是mem_cgroup_charge_common(),如果统计值超过限制就会在...
kmem_cache_shrink()函数通过调用 slab_destroy()撤销高速缓存中所有的 slab。《深入理解 LINUX 内核》P329 3.3 /proc/slabinfo 《深入 LINUX 内核架构》P208 《深入理解 LINUX 内核》P329 3.4 /sys/kernel/slab/ Documentation/ABI/testing/sysfs-kernel-slab ...
memcg_propagate_slab_attrs() abuses the sysfs attribute file functions to propagate settings from the root kmem_cache to a newly created kmem_cache. It does that with: attr->show(root, buf); attr->store(new, buf, strlen(bug); Aside of being a lazy and absurd hackery this is broken ...
ret=memcg_kmem_charge_page(vm->pages[i],GFP_KERNEL,0); if(ret) gotoerr; nr_charged++; } return0; err: /* * If memcg_kmem_charge_page() fails, page's memory cgroup pointer is * NULL, and memcg_kmem_uncharge_page() in free_thread_stack() will ...
kmemleak_update_trace(ret); goto out; } ret = kmem_cache_alloc(radix_tree_node_cachep, gfp_mask | __GFP_ACCOUNT); ret = kmem_cache_alloc(radix_tree_node_cachep, gfp_mask); out: BUG_ON(radix_tree_is_internal_node(ret));