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Date: Mon, 23 Jan 2012 02:15:19 -0800 (PST) From: PINTU KUMAR <pintu_agarwal@...oo.com> To: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "linux-mm@...ck.org" <linux-mm@...ck.org> Subject: [Help] : RSS/PSS showing 0 during smaps for Xorg 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 "!is_cow_mapping()". 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. Thanks. With Regards, Pintu -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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