How do I check used and free RAM memory usage under Linux operating systems using command line and GUI tools? Linux comes with different set of commands to check memory usage. The free command displays the total amount of free and used physical and swap memory in the system, as well as ...
Linux comes with different set of commands to check memory usage. The free command displays the total amount of free and used physical and swap memory in the system, as well as the buffers used by the kernel. The vmstat command reports information about processes, memory, paging, block IO, ...
使用Linux系统的ECS实例时,出现系统卡顿、内部服务响应速度变慢等问题。通过实例健康诊断显示:该实例当前内存的使用率已超过80%。 可能原因 ECS实例中存在异常的进程或服务,占用大量内存,导致内存使用率过高。一般来说,当内存使用率≥80%时,定义为内存使用率过高。建议您通过创建报警规则,实时监控ECS实例的波动情况,具...
Anything * that can move process memory needs to flush the TLB when * moving a PROT_NONE or PROT_NUMA mapped page. */ atomic_t tlb_flush_pending; #ifdef CONFIG_ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH /* See flush_tlb_batched_pending() */ bool tlb_flush_batched; #endif struct uprobes_s...
4.vmstat -s This will share the same results like meminfo but with less information. 5.top The top command is generally used to check memory and cpu usage per process
其触发点在linux-src/mm/page_alloc.c:__alloc_pages_may_oom,当使用各种方法都回收不到内存时会调用out_of_memory函数。 下面我们来看一下out_of_memory函数的实现(经过高度删减):linux-src/mm/oom_kill.c:out_of_memory bool out_of_memory(struct oom_control *oc) { select_bad_process(oc); oom_...
If the process remains in non-sleeping state for a long period, you can preliminarily determine that the system is consistently paging. In such a case, the high CPU usage is caused by insufficient memory. Run the vmstat command to check the virtual memory usage of the system. If the si...
void__initsetup_arch(char**cmdline_p){...max_pfn=e820__end_of_ram_pfn();...#ifdefCONFIG_X86_32/* max_low_pfn get updated here */find_low_pfn_range();#elsecheck_x2apic();/* How many end-of-memory variables you have, grandma! *//* need this before calling reserve_initrd */...
/* High-watermark of RSS usage */ unsigned long hiwater_vm; /* High-water virtual memory usage */ unsigned long total_vm; /* Total pages mapped */ unsigned long locked_vm; /* Pages that have PG_mlocked set */ atomic64_t pinned_vm; /* Refcount permanently increased */ unsigned long...
bool out_of_memory(struct oom_control *oc) { select_bad_process(oc); oom_kill_process(oc, "Out of memory"); } out_of_memory函数的代码逻辑还是非常简单清晰的,总共有两步,1.先选择一个要杀死的进程,2.杀死它。oom_kill_process函数的目的很简单,但是实现过程也有点复杂,这里就不展开分析了,大...