Re: [PATCH v7 0/8] x86/module: use large ROX pages for text allocations
Steven Rostedt <[email protected]>
| Newsgroups | gmane.linux.ports.alpha,gmane.linux.kernel.bpf,gmane.linux.kernel.cross-arch,gmane.linux.ports.arm.kernel,gmane.linux.ports.hexagon,gmane.linux.kernel,gmane.linux.ports.mips,gmane.linux.kernel.mm,gmane.linux.kernel.modules,gmane.linux.ports.parisc,gmane.linux.ports.riscv,gmane.linux.ports.sh.devel,gmane.linux.kernel.arc,gmane.linux.uml.devel,gmane.linux.ports.ppc64.devel,gmane.linux.ports.sparc |
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| Message-ID | <[email protected]> |
On Wed, 23 Oct 2024 19:27:03 +0300 Mike Rapoport <[email protected]> wrote: > From: "Mike Rapoport (Microsoft)" <[email protected]> > > Hi, > > This is an updated version of execmem ROX caches. > FYI, I booted a kernel before and after applying these patches with my change: https://lore.kernel.org/[email protected] Before these patches: # cat /sys/kernel/tracing/dyn_ftrace_total_info 57695 pages:231 groups: 9 ftrace boot update time = 14733459 (ns) ftrace module total update time = 449016 (ns) After: # cat /sys/kernel/tracing/dyn_ftrace_total_info 57708 pages:231 groups: 9 ftrace boot update time = 47195374 (ns) ftrace module total update time = 592080 (ns) Which caused boot time to slowdown by over 30ms. That may not seem like much, but we are very concerned about boot time and are fighting every ms we can get. -- Steve