Total memory usage wrong in user applications

[leavengood]

As can be seen in the attached screenshot, this is hrev41768, an earlier R1/alpha3 GCC4 RC.

All user applications show the wrong amount for total memory, including the bar in ProcessController, the AboutSystem app, and ActivityMonitor. Going into KDL and invoking the avail commands seems to show the correct usage (about 850 MB while I was compiling Haiku in the screenshot.)

The screenshot shows just jam alone consuming almost 370 MB, yet the total shown in AboutSystem is 161 MB. I know we like to talk about Haiku not using much memory, but let's not just lie about it :)

[leavengood]

Screenshot showing incorrect memory usage

[leavengood]

Output from KDL avail, page_stats and swap commands

[leavengood]

Output from KDL slabs command

[bonefish]

The problem is in vm_page_get_stats():

info->used_pages = gMappedPagesCount - blockCachePages;

As can be seen in the page_stats output a lot of pages are inactive (i.e. haven't been used for a long time). Those are ignored here. Adding them will probably fix the issue.

[anevilyak]

Replying to bonefish:

As can be seen in the page_stats output a lot of pages are inactive (i.e. haven't been used for a long time). Those are ignored here. Adding them will probably fix the issue.

Done in hrev43168.