Messages in this thread | | | Date | Sun, 25 Apr 2021 11:07:29 -0700 | From | Davidlohr Bueso <> | Subject | Re: [PATCH 0/1] ipc/util.{c,h}: Use binary search for max_idx |
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On Sun, 25 Apr 2021, Manfred Spraul wrote:
>2nd version of the patch: >@Andrew: Could you add the patch to your mm tree, as candidate for >linux-next? > >Note: >I have tried to remove the ids->max_idx cache entirely. Unfortunately, >this causes a significant slow-down of semstat(,,IPC_STAT): > * no object allocated, no ipcmni_extended: +50% > * no object allocated, with ipcmni_extended: +80% > * 30 objects allocated, with large gaps, no ipcmni_extended: > +350% >Thus I haven't removed ids->max_id.
Right, IPC_STAT is the main usecase for max_id. But I'm not sure why you were looking to remove it in the first place - or was it just to avoid this patch altogether?
Thanks, Davidlohr
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