Re: deferred rss update instead of sloppy rss

From: Nick Piggin (nickpiggin_at_yahoo.com.au)
Date: 11/22/04

  • Next message: Fab Tillier: "RE: [openib-general] Re: [PATCH][RFC/v1][4/12] Add InfiniBand SA(Subnet Administration) query support" 
    Date:	Tue, 23 Nov 2004 09:32:48 +1100
To: Linus Torvalds <torvalds@osdl.org>

    Linus Torvalds wrote:
    >
    > On Mon, 22 Nov 2004, Christoph Lameter wrote:
    >
    >>The problem is then that the proc filesystem must do an extensive scan
    >>over all threads to find users of a certain mm_struct.
    >
    >
    > The alternative is to just add a simple list into the task_struct and the
    > head of it into mm_struct. Then, at fork, you just finish the fork() with
    >
    > list_add(p->mm_list, p->mm->thread_list);
    >
    > and do the proper list_del() in exit_mm() or wherever.
    >
    > You'll still loop in /proc, but you'll do the minimal loop necessary.
    >

    Yes, that was what I was thinking we'd have to resort to. Not a bad idea.

    It would be nice if you could have it integrated with the locking that
    is already there - for example mmap_sem, although that might mean you'd
    have to take mmap_sem for writing which may limit scalability of thread
    creation / destruction... maybe a seperate lock / semaphore for that list
    itself would be OK.

    Deferred rss might be a practical solution, but I'd prefer this if it can
    be made workable.

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  • Next message: Fab Tillier: "RE: [openib-general] Re: [PATCH][RFC/v1][4/12] Add InfiniBand SA(Subnet Administration) query support"

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