Robert Watson wrote:
On Tue, 26 May 2009, Stacey Son wrote:
Add the ksyms(4) pseudo driver. The ksyms driver allows a process to
get a quick snapshot of the kernel's symbol table including the symbols
from any loaded modules (the symbols are all merged into one symbol
table). Unlike like other implementations, this ksyms driver maps
memory in the process memory space to store the snapshot at the time
/dev/ksyms is opened. It also checks to see if the process has already
a snapshot open and won't allow it to open /dev/ksyms it again until it
closes first. This prevents kernel and process memory from being
exhausted. Note that /dev/ksyms is used by the lockstat(1) command.
Reviewed by: gallatin kib (freebsd-arch)
Approved by: gnn (mentor)
One downside to the once-per-process limitation is that it means a
library *and* an application using it can't both use ksyms at once.
Obviously, not a limitation for the current use, but if we start to
grow more consumers it might become one.
Yes, true. One solution may be to allow it to be opened again by the
same process but simply use the same memory mapping and keep a reference
count.
-stacey.
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