On Wed, May 08, 2013 at 11:27:40PM +0530, Shraddha Kamat wrote:

Here is the OOM trace header :

Out of memory: Kill process 5374 (min_free_kbytes) score 944 or sacrifice child Killed process 5374 (min_free_kbytes) total-vm:30495360kB,anon-rss:20155328kB, file-rss:64kB min_free_kbytes invoked oom-killer: gfp_mask=0x200da, order=0, oom_score_adj=0 min_free_kbytes cpuset=/ mems_allowed=0

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I understand that in this case free pages has gone below min_pages(1).

Couple of questions based on these 4 lines :

(1) I googled a lot but I am not able to find the meaning of 'score 994' , anon-rss and file-rss ?

Try reading mm/oom_kill.c.

(2) In my understanding gfp_mask is relevant here to know from which Zone the memory allocation was tried , but failed - right ?

(3) What do order and oom_score_adj signify here ?

oom_score_adj is a per-process /proc entry to adjust the likelihood that a particular process is killed by the OOM code. The word "order" is explained by mm/oom_kill.c, line 600: * @order: amount of memory being requested as a power of 2 Or, better yet, mm/mempolicy.c, line 2024: * @order: Power of two of allocation size in pages. 0 is a single page. HTH, Jonathan Neuschäfer