malloc: move malloc_type_internal into malloc_type

According to code comments the original motivation was to allow for
malloc_type_internal changes without ABI breakage. This can be trivially
accomp

malloc: move malloc_type_internal into malloc_type

According to code comments the original motivation was to allow for
malloc_type_internal changes without ABI breakage. This can be trivially
accomplished by providing spare fields and versioning the struct, as
implemented in the patch below.

The upshots are one less memory indirection on each alloc and disappearance
of mt_zone.

Reviewed by: markj
Differential Revision: https://reviews.freebsd.org/D27104

show more ...

dtrace: depessimize dtmalloc when dtrace is active

Each malloc/free was testing dtrace_malloc_enabled and forcing
extra reads from the malloc type struct to see if perhaps a
dtmalloc probe was on.

dtrace: depessimize dtmalloc when dtrace is active

Each malloc/free was testing dtrace_malloc_enabled and forcing
extra reads from the malloc type struct to see if perhaps a
dtmalloc probe was on.

Treat it like lockstat and sdt: have a global bolean.

show more ...

Use C99 initializers for DTrace provider methods.

This makes the definitions easier to read and more cscope-friendly.

MFC after: 1 week

The dtmalloc provider uses the short description of a malloc type as the
function name of its corresponding DTrace probes. These descriptions may
contain whitespace, but probe names cannot, so just r

The dtmalloc provider uses the short description of a malloc type as the
function name of its corresponding DTrace probes. These descriptions may
contain whitespace, but probe names cannot, so just replace any whitespace
with underscores when creating probes.

MFC after: 1 week

show more ...

Custom DTrace kernel module files plus FreeBSD-specific DTrace providers.