src/sys/amd64/include/profile.h, branch stable/13

sys: Remove $FreeBSD$: one-line .h pattern

2023-08-23T17:43:22Z

Remove /^\s*\*+\s*\$FreeBSD\$.*$\n/ Similar commit in current: (cherry picked from commit 2ff63af9b88c)

Fix high resolution kernel profiling just enough to not crash at boot

2018-06-02T05:48:44Z

time, especially for SMP. If configured, it turns itself on at boot time for calibration, so is fragile even if never otherwise used. Both types of kernel profiling were supposed to use a global spinlock in the SMP case. If hi-res profiling is configured (but not necessarily used), this was supposed to be optimized by only using it when necessary, and slightly more efficiently, in asm. But it was not done at all for mcount entry where it is necessary. This caused crashes in the SMP case when either type of profiling was enabled. For mcount exit, it only caused wrong times. The times were wrongest with an i8254 timer since using that requires exclusive access to the hardware. The i8254 timer was too slow to use here 20 years ago and is much less usable now, but it is the default for the SMP case since TSCs weren't invariant when SMP was new. Do the locking in all hi-res SMP cases for simplicity. Calibration uses special asms, and the clobber lists in these were sort of inverted. They contained the arg and return registers which are not clobbered, but on amd64 they didn't contain the residue of the call-used registers which may be clobbered (%r10 and %r11). This usually caused hangs at boot time. This usually affected even the UP case.

Remove lint support from system headers and MD x86 headers.

2017-11-23T11:40:16Z

Reviewed by: dim, jhb Discussed with: imp Sponsored by: The FreeBSD Foundation Differential revision: https://reviews.freebsd.org/D13156

sys: further adoption of SPDX licensing ID tags.

2017-11-20T19:43:44Z

Mainly focus on files that use BSD 3-Clause license. The Software Package Data Exchange (SPDX) group provides a specification to make it easier for automated tools to detect and summarize well known opensource licenses. We are gradually adopting the specification, noting that the tags are considered only advisory and do not, in any way, superceed or replace the license texts. Special thanks to Wind River for providing access to "The Duke of Highlander" tool: an older (2014) run over FreeBSD tree was useful as a starting point.

Renumber copyright clause 4

2017-02-28T23:42:47Z

Renumber cluase 4 to 3, per what everybody else did when BSD granted them permission to remove clause 3. My insistance on keeping the same numbering for legal reasons is too pedantic, so give up on that point. Submitted by: Jan Schaumann Pull Request: https://github.com/freebsd/freebsd/pull/96

Use intr_disable() and intr_restore() instead of frobbing the flags register

2010-10-25T15:28:03Z

directly to disable interrupts. Reviewed by: bde (earlier version) MFC after: 2 weeks

In the userland .mcount():

2006-10-28T13:12:06Z

- Don't use a frame pointer. Our callers need a frame pointer, but we could only use one to support things that aren't supported. (These things are: - profiling of profiling - debugging of profiling. The core ENTRY() macro doesn't support forcing a frame pointer for debugging, so don't do more here.) - Ensure that we are in the text section and have normal alignment. - Use the normal syntax for `.type'.

i386/include/profile.h:

2006-10-28T11:03:03Z

Fixed a syntax error for the (!__KERNEL && !__GNUCLIKE_ASM) case in rev.1.36. Apparently, this case has never been reached even by lint. Submitted by: stefanf {amd64,i386}/include/profile.h: In case the above case is actually reached, break it properly by providing null support that will fail at link time instead of a stub that gives wrong (null) profiling at runtime.

In MCOUNT_OVERHEAD(label), actually use the `label' parameter. We were

2006-10-28T07:59:11Z

still using the global label named "profil", and this worked accidentally because all callers use the same name.

Remove diffs to i386 version that came in via the compiler support ifdefs.

2005-03-11T22:16:09Z

This changes things like whitespace, inconsistent use of #ifndef vs #if !defined(), different macro argument orders, mismatched comments, etc.