Messages in this thread | | | Date | Wed, 19 Mar 2014 09:36:53 -0400 | From | Don Zickus <> | Subject | Re: [PATCH 02/19] perf, sort: Add physid sorting based on mmap2 data |
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On Wed, Mar 19, 2014 at 11:45:15AM +0100, Jiri Olsa wrote: > > +static int64_t > > +sort__physid_cmp(struct hist_entry *left, struct hist_entry *right) > > +{ > > + u64 l, r; > > + struct map *l_map = left->mem_info->daddr.map; > > + struct map *r_map = right->mem_info->daddr.map; > > + > > + /* store all NULL mem maps at the bottom */ > > + /* shouldn't even need this check, should have stubs */ > > + if (!left->mem_info->daddr.map || !right->mem_info->daddr.map) > > + return 1; > > + > > + /* group event types together */ > > + if (left->cpumode > right->cpumode) return -1; > > + if (left->cpumode < right->cpumode) return 1; > > + > > + if (l_map->maj > r_map->maj) return -1; > > + if (l_map->maj < r_map->maj) return 1; > > + > > + if (l_map->min > r_map->min) return -1; > > + if (l_map->min < r_map->min) return 1; > > + > > + if (l_map->ino > r_map->ino) return -1; > > + if (l_map->ino < r_map->ino) return 1; > > + > > + if (l_map->ino_generation > r_map->ino_generation) return -1; > > + if (l_map->ino_generation < r_map->ino_generation) return 1; > > + > > + /* > > + * Addresses with no major/minor numbers are assumed to be > > + * anonymous in userspace. Sort those on pid then address. > > + * > > + * The kernel and non-zero major/minor mapped areas are > > + * assumed to be unity mapped. Sort those on address then pid. > > + */ > > + > > + /* al_addr does all the right addr - start + offset calculations */ > > + l = left->mem_info->daddr.al_addr; > > + r = right->mem_info->daddr.al_addr; > > + > > + if (l_map->maj || l_map->min || l_map->ino || l_map-> ino_generation) { > > + /* mmapped areas */ > > + > > + /* hack to mark similar regions, 'right' is new entry */ > > + /* entries with same maj/min/ino/inogen are in same address space */ > > + right->color = TRUE; > > + > > + if (l > r) return -1; > > + if (l < r) return 1; > > + > > + /* sorting by iaddr makes calculations easier later */ > > + if (left->mem_info->iaddr.al_addr > right->mem_info->iaddr.al_addr) return -1; > > + if (left->mem_info->iaddr.al_addr < right->mem_info->iaddr.al_addr) return 1; > > + > > + if (left->thread->pid_ > right->thread->pid_) return -1; > > + if (left->thread->pid_ < right->thread->pid_) return 1; > > + > > + if (left->thread->tid > right->thread->tid) return -1; > > + if (left->thread->tid < right->thread->tid) return 1; > > + } else if (left->cpumode == PERF_RECORD_MISC_KERNEL) { > > + /* kernel mapped areas where 'start' doesn't matter */ > > + > > + /* hack to mark similar regions, 'right' is new entry */ > > + /* whole kernel region is in the same address space */ > > + right->color = TRUE; > > + > > + if (l > r) return -1; > > + if (l < r) return 1; > > + > > + /* sorting by iaddr makes calculations easier later */ > > + if (left->mem_info->iaddr.al_addr > right->mem_info->iaddr.al_addr) return -1; > > + if (left->mem_info->iaddr.al_addr < right->mem_info->iaddr.al_addr) return 1; > > + > > + if (left->thread->pid_ > right->thread->pid_) return -1; > > + if (left->thread->pid_ < right->thread->pid_) return 1; > > + > > + if (left->thread->tid > right->thread->tid) return -1; > > + if (left->thread->tid < right->thread->tid) return 1; > > + } else { > > + /* userspace anonymous */ > > + if (left->thread->pid_ > right->thread->pid_) return -1; > > + if (left->thread->pid_ < right->thread->pid_) return 1; > > + > > + if (left->thread->tid > right->thread->tid) return -1; > > + if (left->thread->tid < right->thread->tid) return 1; > > + > > + /* hack to mark similar regions, 'right' is new entry */ > > + /* userspace anonymous address space is contained within pid */ > > + right->color = TRUE; > > + > > + if (l > r) return -1; > > + if (l < r) return 1; > > + > > + /* sorting by iaddr makes calculations easier later */ > > + if (left->mem_info->iaddr.al_addr > right->mem_info->iaddr.al_addr) return -1; > > + if (left->mem_info->iaddr.al_addr < right->mem_info->iaddr.al_addr) return 1; > > + } > > do you need single column for 'physid' ? > > my first idea was to have separate sort entries for all checked entries: > (same way like for memory memory_sort_dimensions) > > - mem_info->daddr.al_addr (we already have 'addr' check) > - mem_info->iaddr.al_addr > - thread->pid_ (we have only 'tid' check so far) > - l_map->maj, l_map->min, l_map->ino, l_map, ino_generation (we could probably group these) > > and init sort order with: > > sort_order = "physid,pid,..."; > > '...' is whatever name you choose for above entries
The problem is (as you can see in the code above), physid is _not_ just one piece of data. It is dependent on multiple things. It is mainly dependent on four things:
- cpumode - major, minor, inode, inode_generation (call it mmap2 data) - data address - pid
If cpumode == KERNEL, sort in this order - mmap2 data - data address - pid (optional)
If cpumode == USERSPACE and mmap2 data != 0, sort in this order - mmap2 data - data address - pid (optional)
If cpumode == USERSAPCE and mmap2 data == 0, sort in this order - pid - data address
Notice how sorting on the pid is different depending on the scenario.
I'll agree that sorting on iaddr and tid can be filtered out as a nice to have.
But in order to sort on physid, you really need lots of pieces. Otherwise, what do you consider the definition of 'physid'? :-)
Cheers, Don
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