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hwpmc: partially depessimize mmap handling if the module is not loaded

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In particular this means the pmc sx lock is no longer taken when an
executable mapping succeeds.

MFC after:	1 week
This commit is contained in:
mjg 2017-01-27 22:13:15 +00:00
parent 01d1547cc2
commit 28a3fa8526
1 changed files with 6 additions and 4 deletions
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10
sys/kern/vfs_vnops.c
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@ -2460,10 +2460,12 @@ vn_mmap(struct file *fp, vm_map_t map, vm_offset_t *addr, vm_size_t size,
}
#ifdef HWPMC_HOOKS
/* Inform hwpmc(4) if an executable is being mapped. */
if (error == 0 && (prot & VM_PROT_EXECUTE) != 0) {
pkm.pm_file = vp;
pkm.pm_address = (uintptr_t) *addr;
PMC_CALL_HOOK(td, PMC_FN_MMAP, (void *) &pkm);
if (PMC_HOOK_INSTALLED(PMC_FN_MMAP)) {
if ((prot & VM_PROT_EXECUTE) != 0 && error == 0) {
pkm.pm_file = vp;
pkm.pm_address = (uintptr_t) *addr;
PMC_CALL_HOOK(td, PMC_FN_MMAP, (void *) &pkm);
}
}
#endif
return (error);