[RFC] mm:change meminfo cached calculation
akpm at linux-foundation.org
Tue Jan 6 16:43:40 PST 2015
On Fri, 26 Dec 2014 19:56:49 +0800 "Wang, Yalin" <Yalin.Wang at sonymobile.com> wrote:
> This patch subtract sharedram from cached,
> sharedram can only be swap into swap partitions,
> they should be treated as swap pages, not as cached pages.
> --- a/fs/proc/meminfo.c
> +++ b/fs/proc/meminfo.c
> @@ -45,7 +45,7 @@ static int meminfo_proc_show(struct seq_file *m, void *v)
> committed = percpu_counter_read_positive(&vm_committed_as);
> cached = global_page_state(NR_FILE_PAGES) -
> - total_swapcache_pages() - i.bufferram;
> + total_swapcache_pages() - i.bufferram - i.sharedram;
> if (cached < 0)
> cached = 0;
: Cached: in-memory cache for files read from the disk (the
: pagecache). Doesn't include SwapCached
So yes, I guess it should not include shmem.
And why not do this as well?
@@ -811,7 +811,7 @@ MemAvailable: An estimate of how much me
Buffers: Relatively temporary storage for raw disk blocks
shouldn't get tremendously large (20MB or so)
Cached: in-memory cache for files read from the disk (the
- pagecache). Doesn't include SwapCached
+ pagecache). Doesn't include SwapCached or Shmem.
SwapCached: Memory that once was swapped out, is swapped back in but
still also is in the swapfile (if memory is needed it
doesn't need to be swapped out AGAIN because it is already
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