svn commit: r226928 - head/sys/vm

Sergey Kandaurov pluknet at
Mon Oct 31 16:33:04 UTC 2011

On 30 October 2011 09:06, Alan Cox <alc at> wrote:
> Author: alc
> Date: Sun Oct 30 05:06:14 2011
> New Revision: 226928
> URL:
> Log:
>  Eliminate vm_phys_bootstrap_alloc().  It was a failed attempt at
>  eliminating duplicated code in the various pmap implementations.
>  Micro-optimize vm_phys_free_pages().
>  Introduce vm_phys_free_contig().  It is fast routine for freeing an
>  arbitrary number of physically contiguous pages.  In particular, it
>  doesn't require the number of pages to be a power of two.
>  Use "u_long" instead of "unsigned long".
>  Bruce Evans (bde@) has convinced me that the "boundary" parameters
>  to kmem_alloc_contig(), vm_phys_alloc_contig(), and
>  vm_reserv_reclaim_contig() should be of type "vm_paddr_t" and not
>  "u_long".  Make this change.


After updating to this revision I constantly get random mtrash_ctor()
assertions. [most often during make installkernel, otherwise idle.]

Below is one of them (previous memory consumers in panicstr differ).

Memory modified after free 0xfffffe0002700800(120) val=0 @ 0xfffffe0002700800
panic: Most recently used by proc-args

cpuid = 1
KDB: stack backtrace:
db_trace_self_wrapper() at 0xffffffff802e009a = db_trace_self_wrapper+0x2a
kdb_backtrace() at 0xffffffff80486f17 = kdb_backtrace+0x37
panic() at 0xffffffff8044f87e = panic+0x2ee
mtrash_ctor() at 0xffffffff8068c904 = mtrash_ctor+0x84
uma_zalloc_arg() at 0xffffffff8068c16c = uma_zalloc_arg+0x2dc
malloc() at 0xffffffff8043abd6 = malloc+0xc6
pargs_alloc() at 0xffffffff804425d3 = pargs_alloc+0x23
kern_execve() at 0xffffffff8041cb47 = kern_execve+0x1277
sys_execve() at 0xffffffff8041ce6d = sys_execve+0x3d
amd64_syscall() at 0xffffffff806c6319 = amd64_syscall+0x299
Xfast_syscall() at 0xffffffff806b16b7 = Xfast_syscall+0xf7
--- syscall (59, FreeBSD ELF64, sys_execve), rip = 0x800d4cbec, rsp =
0x7fffffffd1a8, rbp = 0x8014124a0 ---


More information about the svn-src-all mailing list