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To: "" <>,
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Subject: [Help] : RSS/PSS showing 0 during smaps for Xorg
Date: Mon, 23 Jan 2012 02:15:19 -0800 (PST)	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

Dear All,

I am facing one problem for one of my kernel module for our linux mobile with kernel2.6.36.

When I do cat /proc/<Xorg pid>/smaps | grep -A 11 /dev/ump , to track information for my ump module,
we always get Rss/Pss as 0 kB as shown below:
cat /proc/1731/smaps | grep -A 11 /dev/ump
414db000-415ff000 rw-s 00015000 00:12 6803       /dev/ump
Size:               1168 kB
Rss:                   0 kB
Pss:                   0 kB
track_rss_value = 0, iswalkcalled = 1, smap_pte_range_called = 1, swap_pte = 0, not_pte_present = 0, not_normal_page = 1
isspecial = 0, not_special = 1, isMixedMap = 0, pfnpages_null = 0, pfnoff_flag = 0, not_cow_mapping = 1, normal_page_end = 0
After tracing down the problem, I found out that during "show_smaps" in fs/proc/task_mmu.c and during call to smaps_pte_range the vm_normal_page() is always returning NULL for our /dev/ump driver.
(smaps_pte_range() is the place where Rss/Pss information is populated)
Thus mss->resident (Rss value) is never getting incremented.  
To trace the problem I added few flags during show_smaps & vm_normal_page() as shown above. The value of 1 indicates that the condition is executed.
Thus "normal_page_end" indicates that the "vm_normal_page" has never ended successfully and always returns from 
So, I wanted to know the main cause for vm_normal_page() always returning NULL page for our ump driver. 
What is that I am missing in my driver ?
Can anyone please let me know what could be the problem in our driver.
With Regards,

       reply	other threads:[~2012-01-23 10:15 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <>
2012-01-23 10:15 ` PINTU KUMAR [this message]
2012-01-23 19:31   ` [Help] : RSS/PSS showing 0 during smaps for Xorg Hugh Dickins
2012-01-25  5:22     ` PINTU KUMAR
2012-01-26  0:59       ` Hugh Dickins
2012-01-30  8:42         ` PINTU KUMAR
2012-01-30 18:49           ` Hugh Dickins
2012-02-01 14:49             ` PINTU KUMAR
2012-02-02  5:20               ` Hugh Dickins

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