Author: mjg
Date: Fri Jan 27 22:13:15 2017
New Revision: 312901
URL: https://svnweb.freebsd.org/changeset/base/312901
Log:
hwpmc: partially depessimize mmap handling if the module is not loaded
In particular this means the pmc sx lock is no longer taken when an
executable mapping succeeds.
MFC after: 1 week
Modified:
head/sys/kern/vfs_vnops.c
Modified: head/sys/kern/vfs_vnops.c
==============================================================================
--- head/sys/kern/vfs_vnops.c Fri Jan 27 21:55:47 2017 (r312900)
+++ head/sys/kern/vfs_vnops.c Fri Jan 27 22:13:15 2017 (r312901)
@@ -2460,10 +2460,12 @@ vn_mmap(struct file *fp, vm_map_t map, v
}
#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);
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