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| author | Konstantin Belousov <kib@FreeBSD.org> | 2021-09-13 21:05:47 +0000 |
|---|---|---|
| committer | Konstantin Belousov <kib@FreeBSD.org> | 2021-09-21 17:20:15 +0000 |
| commit | df8dd6025af88a99d34f549fa9591a9b8f9b75b1 (patch) | |
| tree | b635520cbc5b72d1e33e072b02ec87d99aac2729 /sys/amd64/include/proc.h | |
| parent | 0f6829488ef32142b9ea1c0806fb5ecfe0872c02 (diff) | |
| download | src-df8dd6025af88a99d34f549fa9591a9b8f9b75b1.tar.gz src-df8dd6025af88a99d34f549fa9591a9b8f9b75b1.zip | |
amd64: stop using top of the thread' kernel stack for FPU user save area
Instead do one more allocation at the thread creation time. This frees
a lot of space on the stack.
Also do not use alloca() for temporal storage in signal delivery sendsig()
function and signal return syscall sys_sigreturn(). This saves equal
amount of space, again by the cost of one more allocation at the thread
creation time.
A useful experiment now would be to reduce KSTACK_PAGES.
Reviewed by: jhb, markj
Tested by: pho
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D31954
Diffstat (limited to 'sys/amd64/include/proc.h')
| -rw-r--r-- | sys/amd64/include/proc.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/sys/amd64/include/proc.h b/sys/amd64/include/proc.h index 0f8cf50e326d..bd07f70f8d44 100644 --- a/sys/amd64/include/proc.h +++ b/sys/amd64/include/proc.h @@ -75,6 +75,8 @@ struct mdthread { int md_efirt_dis_pf; /* (k) */ struct pcb md_pcb; vm_offset_t md_stack_base; + struct savefpu *md_usr_fpu_save; + struct savefpu *md_fpu_scratch; }; struct mdproc { |