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vmalloc: better detect default region size on Linux

This is a Linux-specific fix for vmalloc from OpenSUSE, for what
that's still worth; we're not going to keep using vmalloc long term.
https://build.opensuse.org/package/view_file/shells/ksh/ksh93-vm.dif
This commit is contained in:
Martijn Dekker 2021-02-02 05:33:24 +00:00
parent e2c2753ee8
commit 3002c4113e
2 changed files with 14 additions and 0 deletions

View file

@ -152,6 +152,9 @@ extern void _vmmessage _ARG_((const char*, long, const char*, long));
#endif /*DEBUG*/
#define VMPAGESIZE 8192
#if defined(__linux__) && !defined(_lib_getpagesize)
#define _lib_getpagesize 1
#endif
#if _lib_getpagesize
#define GETPAGESIZE(x) ((x) ? (x) : ((x)=getpagesize()) )
#else

View file

@ -63,8 +63,10 @@ void _STUB_vmmapopen(){}
/* magic word signaling file/segment is ready */
#define MM_MAGIC ((unsigned int)(('P'<<24) | ('&'<<16) | ('N'<<8) | ('8')) )
#ifndef __linux__
/* default minimum region size */
#define MM_MINSIZE (64*_Vmpagesize)
#endif
/* macros to get the data section and size */
#define MMHEAD(file) ROUND(sizeof(Mmvm_t)+strlen(file), ALIGN)
@ -167,9 +169,18 @@ static int mminit(Mmdisc_t* mmdc)
if(mmdc->mmvm) /* already done this */
return 0;
#ifndef __linux__
/* fixed size region so make it reasonably large */
if((size = mmdc->size) < MM_MINSIZE )
size = MM_MINSIZE;
#else /* on Linux */
if (sizeof(void*) > 32)
extent = ROUND(0x80000,_Vmpagesize);
else
extent = ROUND(0x40000,_Vmpagesize);
if((size = mmdc->size) < extent)
size = extent;
#endif
size += MMHEAD(mmdc->file) + ALIGN;
size = ROUND(size, _Vmpagesize);