Just a reminder that some of us (just me?) do well over 100+ builds per day ... if this can be optimised some what that would be good.
These measurements for the worst case (allmodconfig). Is it possible to measure the slowdown in your case? How it will perform on your typical workflow?
Looks like it is possible to optimize it, but I need some hints from Masahiro on how to do it properly. Because I don't know how to match __ksymtab_<symbol> with the <symbol> without an additional loop. Introduce another hash table?
The first loop from this patch could traverse only the exported symbols instead of all symbols. But in this case, I don't know how to break early from the loop because there can be many symbols with the same name but with the different scope (static/non-static).
For example, ring_buffer_size: kernel/trace/ring_buffer.c 4334:unsigned long ring_buffer_size(struct ring_buffer *buffer, int cpu) 4347:EXPORT_SYMBOL_GPL(ring_buffer_size); And drivers/usb/misc/ldusb.c 125:static int ring_buffer_size = 128; Or for, nfs4_disable_idmapping: fs/nfs/super.c 2920:bool nfs4_disable_idmapping = true; 2930:EXPORT_SYMBOL_GPL(nfs4_disable_idmapping); fs/nfsd/nfs4idmap.c 48:static bool nfs4_disable_idmapping = true; Regards, Denis
