Re: [RFC PATCH 16/20] famfs: Add fault counters

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]


Matthew Wilcox wrote:
> On Fri, Feb 23, 2024 at 03:50:33PM -0800, Dan Williams wrote:
> > Certainly something like that would have satisified this sanity test use
> > case. I will note that mm_account_fault() would need some help to figure
> > out the size of the page table entry that got installed. Maybe
> > extensions to vm_fault_reason to add VM_FAULT_P*D? That compliments
> > VM_FAULT_FALLBACK to indicate whether, for example, the fallback went
> > from PUD to PMD, or all the way back to PTE.
> ugh, no, it's more complicated than that.  look at the recent changes to
> set_ptes().  we can now install PTEs of many different sizes, depending
> on the architecture.  someday i look forward to supporting all the page
> sizes on parisc (4k, 16k, 64k, 256k, ... 4G)


There are enough bits in vm_fault_t to represent many page sizes instead
of the entry type as I suggested, but I would defer to you or Dave on
how to make "installed pte size" generically traceable per Dave's

[Index of Archives]     [Linux Ext4 Filesystem]     [Union Filesystem]     [Filesystem Testing]     [Ceph Users]     [Ecryptfs]     [NTFS 3]     [AutoFS]     [Kernel Newbies]     [Share Photos]     [Security]     [Netfilter]     [Bugtraq]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux Cachefs]     [Reiser Filesystem]     [Linux RAID]     [NTFS 3]     [Samba]     [Device Mapper]     [CEPH Development]

  Powered by Linux