emo/procps
1
0
Fork 0
Code Issues Pull Requests Packages Releases Activity

library: correct 'used' memory calculations, <meminfo>

Browse Source 
The <meminfo> module attempted to duplicate the former
sysinfo memory calculations wherein 'SReclaimable' was
added to 'Cached' for the 'kb_main_cached' equivalent.

But, this original approach was wrong for two reasons.

1. The addition occurred too late to impact the 'USED'
calculation which could then cause an underflow in the
top memory display if 'SReclaimable' was heavily used.

2. In changing the actual /proc/meminfo 'Cached' value
it meant that users could not rely on that proc(5) man
page when interpreting the MEMINFO_MEM_CACHED results.

So this commit adds a new enumerator for the inclusive
cached amount plus repositions the calculation so that
a MEMINFO_MEM_USED result will exclude 'SReclaimable'.

Signed-off-by: Jim Warner <james.warner@comcast.net>
This commit is contained in:
Jim Warner
2017-05-29 01:11:11 -05:00
committed by Craig Small
parent e3bad0687d
commit dbc880edd3
2 changed files with 10 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
proc/meminfo.h
View File

@@ -37,6 +37,7 @@ enum meminfo_item {
MEMINFO_MEM_BOUNCE, // ul_int
MEMINFO_MEM_BUFFERS, // ul_int
MEMINFO_MEM_CACHED, // ul_int
MEMINFO_MEM_CACHED_ALL, // ul_int
MEMINFO_MEM_COMMIT_LIMIT, // ul_int
MEMINFO_MEM_COMMITTED_AS, // ul_int
MEMINFO_MEM_HARD_CORRUPTED, // ul_int
@@ -79,6 +80,7 @@ enum meminfo_item {
MEMINFO_DELTA_BOUNCE, // s_int
MEMINFO_DELTA_BUFFERS, // s_int
MEMINFO_DELTA_CACHED, // s_int
MEMINFO_DELTA_CACHED_ALL, // s_int
MEMINFO_DELTA_COMMIT_LIMIT, // s_int
MEMINFO_DELTA_COMMITTED_AS, // s_int
MEMINFO_DELTA_HARD_CORRUPTED, // s_int