Messages in this thread | | | Subject | Re: Why is Shmem included in Cached in /proc/meminfo? | From | Randy Dunlap <> | Date | Mon, 30 Aug 2021 07:34:38 -0700 |
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On 8/30/21 12:44 AM, Mikko Rantalainen wrote: > It's not immediately obvious from fs/proc/meminfo.c function > meminfo_proc_show() but the output of Cached: field seems to always > include all of Shmem: field, too. > > Is this intentional? Usually cache is something that can be discarded if > needed but shared memory (e.g. used to contain files in tmpfs) cannot be > discarded without a data-loss. As such, I'd argue that it shouldn't be > included in the Cached: output. > > A simple fix could be > > - cached = global_node_page_state(NR_FILE_PAGES) - > - total_swapcache_pages() - i.bufferram; > + cached = global_node_page_state(NR_FILE_PAGES) - > + total_swapcache_pages() > + - i.bufferram - i.sharedram; >
-- ~Randy
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