lkml.org 
[lkml]   [2009]   [Jan]   [14]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: [PATCH 03/16] dma-debug: add hash functions for dma_debug_entries
    On Wed, 14 Jan 2009 12:43:47 +0100 Ingo Molnar <mingo@elte.hu> wrote:

    >
    > * Andrew Morton <akpm@linux-foundation.org> wrote:
    >
    > > On Fri, 9 Jan 2009 17:19:17 +0100 Joerg Roedel <joerg.roedel@amd.com> wrote:
    > >
    > > > +struct hash_bucket {
    > > > + struct list_head list;
    > > > + spinlock_t lock;
    > > > +} ____cacheline_aligned;
    > >
    > > __cacheline_aligned_in_smp.
    > >
    > > This all looks like an exotically large amount of code for a debug
    > > thingy?
    >
    > this code checks the DMA usage of ~1 million lines of kernel code - all
    > the DMA using drivers. I think Joerg's feature is hugely relevant as DMA
    > scribbles are one of the hardest to debug kernel bugs: they can end up in
    > permanent data corruption or other hard to find bugs. In fact i think his
    > patchset is rather simple and even having 10 times as much debug code
    > would pay for its existence in the long run.
    >

    Have we previously found bugs by other means which this facility would
    have detected? I don't recall any...



    \
     
     \ /
      Last update: 2009-01-14 18:43    [W:0.023 / U:124.132 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site