Replace the last non-optional use of sbrk() in the tree with mmap().
All gmon want's is a region of memory without the overhead of malloc().
Just mapping some pages with mmap is an easy way to accomplish this.
Approved by: jhb, cem, emaste
Obtained from: CheriBSD (bf33e1e70b
)
Sponsored by: DARPA, AFRL
Differential Revision: https://reviews.freebsd.org/D5005
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parent
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Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=294523
@ -37,6 +37,7 @@ __FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/time.h>
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#include <sys/gmon.h>
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#include <sys/mman.h>
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#include <sys/sysctl.h>
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#include <err.h>
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@ -50,14 +51,6 @@ __FBSDID("$FreeBSD$");
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#include "libc_private.h"
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#if defined(__i386__) || defined(__sparc64__) || defined(__amd64__) || (defined(__powerpc__) && !defined(__powerpc64__))
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extern char *minbrk __asm (".minbrk");
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#elif defined(__powerpc64__)
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extern char *minbrk __asm ("_minbrk");
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#else
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extern char *minbrk __asm ("minbrk");
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#endif
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struct gmonparam _gmonparam = { GMON_PROF_OFF };
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static int s_scale;
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@ -94,8 +87,9 @@ monstartup(u_long lowpc, u_long highpc)
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p->tolimit = MAXARCS;
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p->tossize = p->tolimit * sizeof(struct tostruct);
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cp = sbrk(p->kcountsize + p->fromssize + p->tossize);
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if (cp == (char *)-1) {
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cp = mmap(NULL, p->kcountsize + p->fromssize + p->tossize,
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PROT_READ | PROT_WRITE, MAP_ANON, -1, 0);
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if (cp == MAP_FAILED) {
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ERR("monstartup: out of memory\n");
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return;
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}
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@ -108,7 +102,6 @@ monstartup(u_long lowpc, u_long highpc)
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cp += p->kcountsize;
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p->froms = (u_short *)cp;
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minbrk = sbrk(0);
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p->tos[0].link = 0;
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o = p->highpc - p->lowpc;
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