* Peter Zijlstra <peterz@xxxxxxxxxxxxx> wrote: > On Fri, Jul 12, 2013 at 11:15:06AM +0200, Ingo Molnar wrote: > > > > * Peter Zijlstra <peterz@xxxxxxxxxxxxx> wrote: > > > > > We need those files anyway.. The current proposal is that the entire VMA > > > has a single userspace pointer in it. Or rather a 64bit value. > > > > Yes but accessible via /proc/<PID>/mem or so? > > *shudder*.. yes. But you're again opening two files. The only advantage > of this over userspace writing its own files is that the kernel cleans > things up for you. Opening of the files only occurs in the instrumentation case, which is rare. But temporary files would be forced upon the regular usecase when no instrumentation goes on. > However from what I understood android runs apps as individual users, > and I think we can do per user tmpfs mounts. So app dies, user exits, > mount goes *poof*. Yes, user-space could be smarter about temporary files. Just like big banks could be less risk happy. Yet the reality is that if left alone both apps and banks mess up, I don't think libertarianism works for policy: we are better off offering a framework that is simple, robust, self-contained, low risk and hard to mess up? > > I was thinking about it in the context of its original purpose: naming > > heap areas, which are pretty anonymous right now - /proc/*/maps is > > full of mystery ranges today. > > It is.. although I've myself never had trouble with that. Most every > memory debugging that I've used/written over the past two decades was > adequately able to identify memory regions. So, these 400+ memory ranges are from Firefox's /proc/*/maps file: 7fbf59eff000-7fbf59f00000 ---p 00000000 00:00 0 7fbf59f00000-7fbf5a800000 rw-p 00000000 00:00 0 7fbf5a900000-7fbf5aa00000 rw-p 00000000 00:00 0 7fbf5ad00000-7fbf5ae00000 rw-p 00000000 00:00 0 7fbf5af00000-7fbf5b000000 rw-p 00000000 00:00 0 7fbf5b100000-7fbf5b200000 rw-p 00000000 00:00 0 7fbf5b500000-7fbf5b600000 rw-p 00000000 00:00 0 7fbf5b800000-7fbf5b900000 rw-p 00000000 00:00 0 7fbf5bb00000-7fbf5bc00000 rw-p 00000000 00:00 0 7fbf5c000000-7fbf5c100000 rw-p 00000000 00:00 0 7fbf5c200000-7fbf5c300000 rw-p 00000000 00:00 0 7fbf5c800000-7fbf5c900000 rw-p 00000000 00:00 0 7fbf5ca00000-7fbf5cb00000 rw-p 00000000 00:00 0 7fbf5ce00000-7fbf5cf00000 rw-p 00000000 00:00 0 7fbf5d200000-7fbf5d300000 rw-p 00000000 00:00 0 7fbf5d400000-7fbf5d500000 rw-p 00000000 00:00 0 7fbf5db00000-7fbf5dc00000 rw-p 00000000 00:00 0 7fbf5dd00000-7fbf5de00000 rw-p 00000000 00:00 0 7fbf5df00000-7fbf5e000000 rw-p 00000000 00:00 0 7fbf5e300000-7fbf5e400000 rw-p 00000000 00:00 0 7fbf5e500000-7fbf5e600000 rw-p 00000000 00:00 0 7fbf5e900000-7fbf5ea00000 rw-p 00000000 00:00 0 7fbf5eb00000-7fbf5ec00000 rw-p 00000000 00:00 0 7fbf5ed00000-7fbf5ef00000 rw-p 00000000 00:00 0 7fbf5f2ff000-7fbf5f300000 ---p 00000000 00:00 0 7fbf5f300000-7fbf5fc00000 rw-p 00000000 00:00 0 7fbf5fd00000-7fbf5fe00000 rw-p 00000000 00:00 0 7fbf5ff00000-7fbf60000000 rw-p 00000000 00:00 0 7fbf60200000-7fbf60300000 rw-p 00000000 00:00 0 7fbf60600000-7fbf60700000 rw-p 00000000 00:00 0 7fbf60800000-7fbf60900000 rw-p 00000000 00:00 0 7fbf60a00000-7fbf60b00000 rw-p 00000000 00:00 0 7fbf60e00000-7fbf60f00000 rw-p 00000000 00:00 0 7fbf61000000-7fbf61100000 rw-p 00000000 00:00 0 7fbf61a00000-7fbf61b00000 rw-p 00000000 00:00 0 7fbf61c00000-7fbf61d00000 rw-p 00000000 00:00 0 7fbf62000000-7fbf62100000 rw-p 00000000 00:00 0 7fbf62200000-7fbf62300000 rw-p 00000000 00:00 0 7fbf62400000-7fbf62500000 rw-p 00000000 00:00 0 7fbf62600000-7fbf62700000 rw-p 00000000 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00:00 0 7fbfa0f00000-7fbfa1000000 rw-p 00000000 00:00 0 7fbfa1100000-7fbfa1300000 rw-p 00000000 00:00 0 7fbfa1400000-7fbfa1700000 rw-p 00000000 00:00 0 7fbfa1a00000-7fbfa4a00000 rw-p 00000000 00:00 0 7fbfa4e00000-7fbfa7400000 rw-p 00000000 00:00 0 7fbfa74fa000-7fbfa74fb000 ---p 00000000 00:00 0 7fbfa7cfb000-7fbfa7cfc000 ---p 00000000 00:00 0 7fbfa84fc000-7fbfa84fd000 ---p 00000000 00:00 0 7fbfa908d000-7fbfa9091000 rw-p 00000000 00:00 0 7fbfa94fe000-7fbfa94ff000 ---p 00000000 00:00 0 7fbfa9cff000-7fbfa9d00000 ---p 00000000 00:00 0 7fbfab2ff000-7fbfab300000 ---p 00000000 00:00 0 7fbfac6ff000-7fbfac700000 ---p 00000000 00:00 0 7fbfaec2c000-7fbfaec2d000 ---p 00000000 00:00 0 7fbfaef00000-7fbfaf300000 rw-p 00000000 00:00 0 7fbfafa00000-7fbfafb00000 rw-p 00000000 00:00 0 7fbfafc00000-7fbfafd00000 rw-p 00000000 00:00 0 7fbfb087c000-7fbfb087d000 rw-p 00000000 00:00 0 7fbfb0f00000-7fbfb1000000 rw-p 00000000 00:00 0 7fbfb1700000-7fbfb1d00000 rw-p 00000000 00:00 0 7fbfb1dff000-7fbfb1e00000 ---p 00000000 00:00 0 7fbfb283e000-7fbfb284e000 rwxp 00000000 00:00 0 7fbfb2b00000-7fbfb3200000 rw-p 00000000 00:00 0 7fbfb3200000-7fbfb3300000 rw-p 00000000 00:00 0 7fbfb3500000-7fbfb3c00000 rw-p 00000000 00:00 0 7fbfb3c1b000-7fbfb3c3b000 rwxp 00000000 00:00 0 7fbfb3cfb000-7fbfb3cfc000 ---p 00000000 00:00 0 7fbfb4700000-7fbfb4b00000 rw-p 00000000 00:00 0 7fbfb4b00000-7fbfb5200000 rw-p 00000000 00:00 0 7fbfb56fd000-7fbfb56fe000 ---p 00000000 00:00 0 7fbfb5efe000-7fbfb5eff000 ---p 00000000 00:00 0 7fbfb66ff000-7fbfb6700000 ---p 00000000 00:00 0 7fbfb70be000-7fbfb70bf000 ---p 00000000 00:00 0 7fbfb70ff000-7fbfb7100000 ---p 00000000 00:00 0 7fbfb85c2000-7fbfb85f0000 rw-p 00000000 00:00 0 7fbfb889b000-7fbfb889c000 rw-p 00000000 00:00 0 7fbfb9362000-7fbfb9363000 rw-p 00000000 00:00 0 7fbfb987a000-7fbfb987b000 rw-p 00000000 00:00 0 7fbfb9ec2000-7fbfb9ec3000 rw-p 00000000 00:00 0 7fbfba712000-7fbfba713000 rw-p 00000000 00:00 0 7fbfbac2e000-7fbfbac30000 rw-p 00000000 00:00 0 7fbfbd7f1000-7fbfbdb00000 rw-p 00000000 00:00 0 7fbfbdbfd000-7fbfbdbfe000 ---p 00000000 00:00 0 7fbfbe3fe000-7fbfbe3ff000 ---p 00000000 00:00 0 7fbfbebff000-7fbfbec00000 ---p 00000000 00:00 0 7fbfbf9ff000-7fbfbfa00000 ---p 00000000 00:00 0 7fbfc7e00000-7fbfc8500000 rw-p 00000000 00:00 0 7fbfc858a000-7fbfc859a000 rwxp 00000000 00:00 0 7fbfc859a000-7fbfc859b000 ---p 00000000 00:00 0 7fbfc929b000-7fbfc929f000 rw-p 00000000 00:00 0 7fbfc9700000-7fbfc9900000 rw-p 00000000 00:00 0 7fbfc990b000-7fbfc993b000 rwxp 00000000 00:00 0 7fbfc9986000-7fbfc9996000 rwxp 00000000 00:00 0 7fbfc99ef000-7fbfc99ff000 rwxp 00000000 00:00 0 7fbfc99ff000-7fbfc9a00000 ---p 00000000 00:00 0 7fbfcae02000-7fbfcae32000 rwxp 00000000 00:00 0 7fbfcae32000-7fbfcae33000 ---p 00000000 00:00 0 7fbfcb633000-7fbfcb634000 ---p 00000000 00:00 0 7fbfcc234000-7fbfcc235000 ---p 00000000 00:00 0 7fbfcca35000-7fbfcca36000 ---p 00000000 00:00 0 7fbfcdaf8000-7fbfcdaf9000 rw-p 00000000 00:00 0 7fbfcdd00000-7fbfcde00000 rw-p 00000000 00:00 0 7fbfcde04000-7fbfcde24000 rwxp 00000000 00:00 0 7fbfcde2c000-7fbfcde3c000 rwxp 00000000 00:00 0 7fbfcde50000-7fbfcde70000 rwxp 00000000 00:00 0 7fbfce0e7000-7fbfce0e8000 ---p 00000000 00:00 0 7fbfcef00000-7fbfcf000000 rw-p 00000000 00:00 0 7fbfcf005000-7fbfcf015000 rwxp 00000000 00:00 0 7fbfcf0ff000-7fbfcf100000 ---p 00000000 00:00 0 7fbfcfa0a000-7fbfcfa1a000 rwxp 00000000 00:00 0 7fbfd030a000-7fbfd030b000 ---p 00000000 00:00 0 7fbfd113c000-7fbfd113e000 rw-p 00000000 00:00 0 7fbfd2af6000-7fbfd2af7000 rw-p 00000000 00:00 0 7fbfd326d000-7fbfd326e000 rw-p 00000000 00:00 0 7fbfd401f000-7fbfd4020000 rw-p 00000000 00:00 0 7fbfd48f1000-7fbfd48f2000 rw-p 00000000 00:00 0 7fbfd4b8c000-7fbfd4b8d000 rw-p 00000000 00:00 0 7fbfd5c00000-7fbfd5d00000 rw-p 00000000 00:00 0 7fbfd5d0e000-7fbfd5d3e000 rwxp 00000000 00:00 0 7fbfd7f2a000-7fbfd7f2e000 rw-p 00000000 00:00 0 7fbfd8b8e000-7fbfd8b92000 rw-p 00000000 00:00 0 7fbfd9be0000-7fbfd9be2000 rw-p 00000000 00:00 0 7fbfd9e00000-7fbfd9e01000 rw-p 00000000 00:00 0 7fbfdbe81000-7fbfdbe82000 rw-p 00000000 00:00 0 7fbfdc6ac000-7fbfdc6ae000 rw-p 00000000 00:00 0 7fbfdcf07000-7fbfdcf09000 rw-p 00000000 00:00 0 7fbfdd20b000-7fbfdd20d000 rw-p 00000000 00:00 0 7fbfdd89e000-7fbfdd89f000 rw-p 00000000 00:00 0 7fbfde597000-7fbfde598000 rw-p 00000000 00:00 0 7fbfe1e0d000-7fbfe1f9c000 rw-p 00000000 00:00 0 7fbfe2427000-7fbfe2428000 rw-p 00000000 00:00 0 7fbfe2b87000-7fbfe2b89000 rw-p 00000000 00:00 0 7fbfe35fd000-7fbfe3700000 rw-p 00000000 00:00 0 7fbfe3701000-7fbfe3711000 rwxp 00000000 00:00 0 7fbfe3d64000-7fbfe3d69000 rw-p 00000000 00:00 0 7fbfe3f82000-7fbfe3f86000 rw-p 00000000 00:00 0 7fbfe4579000-7fbfe458e000 rw-p 00000000 00:00 0 7fbfe47b7000-7fbfe47b8000 rw-p 00000000 00:00 0 7fbfe47b8000-7fbfe47b9000 rwxp 00000000 00:00 0 7fbfe47d7000-7fbfe47e7000 rwxp 00000000 00:00 0 7fbfe4883000-7fbfe4989000 rw-p 00000000 00:00 0 7fbfe49b2000-7fbfe49b4000 rw-p 00000000 00:00 0 It's about 35% out of 1300+ mappings that Firefox uses. It is likely that the ---p mappings (about 40 of them) are guard pages. How do I tell what the remaining anonymous areas are about? Thanks, Ingo -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>