On 27.03.2015 19:40, Vlastimil Babka wrote:
From: Jerome Marchand <jmarchan@xxxxxxxxxx> Currently looking at /proc/<pid>/status or statm, there is no way to distinguish shmem pages from pages mapped to a regular file (shmem pages are mapped to /dev/zero), even though their implication in actual memory use is quite different. This patch adds MM_SHMEMPAGES counter to mm_rss_stat to account for shmem pages instead of MM_FILEPAGES. Signed-off-by: Jerome Marchand <jmarchan@xxxxxxxxxx> Signed-off-by: Vlastimil Babka <vbabka@xxxxxxx> ---
--- a/include/linux/mm_types.h +++ b/include/linux/mm_types.h @@ -327,9 +327,12 @@ struct core_state { }; enum { - MM_FILEPAGES, - MM_ANONPAGES, - MM_SWAPENTS, + MM_FILEPAGES, /* Resident file mapping pages */ + MM_ANONPAGES, /* Resident anonymous pages */ + MM_SWAPENTS, /* Anonymous swap entries */ +#ifdef CONFIG_SHMEM + MM_SHMEMPAGES, /* Resident shared memory pages */ +#endif
I prefer to keep that counter unconditionally: kernel has MM_SWAPENTS even without CONFIG_SWAP.
NR_MM_COUNTERS };
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