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Udo A. Steinberg wrote: >On Fri, 20 Aug 2004 17:49:55 +1000 Nick Piggin (NP) wrote: > >NP> Can you reproduce the OOM with the following patch please? Then >NP> send the output. > >I reproduced the problem using a slightly different setup to trigger the >problem faster: 128 MB RAM, 188992 KB swap > >Here's the output of the OOM killer with your patch applied: > >oom-killer: gfp_mask=0x1d2 >DMA per-cpu: >cpu 0 hot: low 2, high 6, batch 1 >cpu 0 cold: low 0, high 2, batch 1 >Normal per-cpu: >cpu 0 hot: low 14, high 42, batch 7 >cpu 0 cold: low 0, high 14, batch 7 >HighMem per-cpu: empty > >Free pages: 1316kB (0kB HighMem) >Active:5281 inactive:23611 dirty:0 writeback:0 unstable:0 free:329 slab:1403 mapped:12232 pagetables:167 >DMA free:712kB min:44kB low:88kB high:132kB active:5076kB inactive:5332kB present:16384kB pages_scanned:10112 all_unreclaimable? yes >protections[]: 22 178 178 >Normal free:604kB min:312kB low:624kB high:936kB active:16048kB inactive:89112kB present:114688kB pages_scanned:62432 all_unreclaimable? yes >protections[]: 0 156 156 >HighMem free:0kB min:128kB low:256kB high:384kB active:0kB inactive:0kB present:0kB pages_scanned:0 all_unreclaimable? no >protections[]: 0 0 0 >DMA: 0*4kB 3*8kB 13*16kB 1*32kB 1*64kB 1*128kB 1*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 712kB >Normal: 1*4kB 1*8kB 1*16kB 0*32kB 1*64kB 0*128kB 0*256kB 1*512kB 0*1024kB 0*2048kB 0*4096kB = 604kB >HighMem: empty >Swap cache: add 90886, delete 74524, find 4659/4974, race 0+0 >Out of Memory: Killed process 1217 (gphoto2). > > OK, all_unreclaimable caused the scanner to virtually stop. If all_unreclaimable gets set, it throttles the scanning of that zone right back, which in turn greatly lowers the chance that all_unreclaimable will get cleared. When we get to priority = 0 in try_to_free_pages (ie. close to OOM), it might be worth clearing each zone's all_unreclaimable for this last time 'round the loop. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.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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