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# grep HugePages /proc/meminfo AnonHugePages: 274432 kB HugePages_@R_883_10586@l: 1008 HugePages_Free: 596 HugePages_Rsvd: 594 HugePages_Surp: 0
我的问题涉及“免费”和“Rsvd”号码 – 为什么它们不加起来总计1008?他们实际上加起来是1190.我在这里不理解什么?@H_489_19@
如果现在有3个大页面的请求,那么它将失败,因为只有2个可用于保留.将其视为malloc()调用,当您保留内存虚拟页面以考虑进程的VSZ时,但当进程实际使用它们时,它将成为进程的RSZ(运行集).@H_489_19@
由于大页面总是驻留在主内存上,当应用程序请求它们时,内核会从空闲池中减少它并增加Rsvd计数器.@H_489_19@
这是来自内核源代码. https://www.kernel.org/doc/Documentation/vm/hugetlbpage.txt@H_489_19@
where: HugePages_@R_883_10586@l is the size of the pool of huge pages. HugePages_Free is the number of huge pages in the pool that are not yet allocated. HugePages_Rsvd is short for "reserved," and is the number of huge pages for which a commitment to allocate from the pool has been made,but no alLOCATIOn has yet been made. Reserved huge pages guarantee that an application will be able to allocate a huge page from the pool of huge pages at fault time. HugePages_Surp is short for "surplus," and is the number of huge pages in the pool above the value in /proc/sys/vm/nr_hugepages. The maximum number of surplus huge pages is controlled by /proc/sys/vm/nr_overcommit_hugepages.
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