On 12 Aug 2022, at 21:11, Randy Dunlap wrote: > Hi-- > > On 8/11/22 16:16, Zi Yan wrote: >> diff --git a/mm/Kconfig b/mm/Kconfig >> index e558f5679707..acccb919d72d 100644 >> --- a/mm/Kconfig >> +++ b/mm/Kconfig >> @@ -455,6 +455,19 @@ config SET_MAX_ORDER >> increase this value. A value of 10 means that the largest free memory >> block is 2^10 pages. >> >> +config BOOT_TIME_MAX_ORDER >> + bool "Set maximum order of buddy allocator at boot time" >> + depends on SPARSEMEM_VMEMMAP && (ARCH_FORCE_MAX_ORDER != 0 || SET_MAX_ORDER != 0) >> + help >> + It enables users to set the maximum order of buddy allocator at system >> + boot time instead of a static MACRO set at compilation time. Systems with >> + a lot of memory might want to allocate large pages whereas it is much >> + less feasible and desirable for systems with less memory. This option >> + allows different systems to control the largest page they want to >> + allocate. By default, MAX_ORDER will be set to ARCH_FORCE_MAX_ORDER or >> + SET_MAX_ORDER, whichever is non-zero, when the boot time parameter is not >> + set. The maximum of MAX_ORDER is currently limited at 256. > > Please make sure that all lines of help text are indented with one tab + 2 spaces, > as specified in Documentation/process/coding-style.rst. Thanks. I fixed it locally. -- Best Regards, Yan, Zi
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