On 03/27/2015 06:09 PM, Konstantin Khlebnikov wrote:
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.
Hmm, so just for consistency? I don't see much reason to make life
harder for tiny systems, especially when it's not too much effort.
NR_MM_COUNTERS
};
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