Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754149AbcCMQes (ORCPT ); Sun, 13 Mar 2016 12:34:48 -0400 Received: from thoth.sbs.de ([192.35.17.2]:37223 "EHLO thoth.sbs.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753588AbcCMQej (ORCPT ); Sun, 13 Mar 2016 12:34:39 -0400 Subject: Re: [PATCHv3 09/13] scripts/gdb: Add meminfo command To: Kieran Bingham , linux-kernel@vger.kernel.org References: <1457005267-843-1-git-send-email-kieran.bingham@linaro.org> <1457005267-843-10-git-send-email-kieran.bingham@linaro.org> Cc: lee.jones@linaro.org, peter.griffin@linaro.org, maxime.coquelin@st.com From: Jan Kiszka Message-ID: <56E5969A.3030306@siemens.com> Date: Sun, 13 Mar 2016 17:34:34 +0100 User-Agent: Mozilla/5.0 (X11; U; Linux i686 (x86_64); de; rv:1.8.1.12) Gecko/20080226 SUSE/2.0.0.12-1.1 Thunderbird/2.0.0.12 Mnenhy/0.7.5.666 MIME-Version: 1.0 In-Reply-To: <1457005267-843-10-git-send-email-kieran.bingham@linaro.org> Content-Type: text/plain; charset=iso-8859-15 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 11071 Lines: 282 On 2016-03-03 12:41, Kieran Bingham wrote: > Provide an equivalent of /proc/meminfo which should be available from > core dumps, or crashed kernels. This should allow a debugger to identify > if memory pressures were applicable in the instance of their issue > Sound useful. > Signed-off-by: Kieran Bingham > > --- > > Changes from v1: > - Updated to use LX_ macros for constants > - Utilise the LX_CONFIG() options for conditional printing > - Fixed meminfo command on Jan's target .config > - Added missing segments to meminfo command (HUGEPAGE, QUICKLIST) > - Adjusted for new list_for_each_entry() function > - Fixed up for !CONFIG_SWAP and !CONFIG_MMU targets (Tested STM32) > > Changes from v2: > - Reduce line size on output lines causing pep8 warnings > - Remove crept in 'pass' statement > --- > scripts/gdb/linux/constants.py.in | 34 ++++++ > scripts/gdb/linux/proc.py | 228 ++++++++++++++++++++++++++++++++++++++ > 2 files changed, 262 insertions(+) > > diff --git a/scripts/gdb/linux/constants.py.in b/scripts/gdb/linux/constants.py.in > index 57213ad8cf75..66562a8242bd 100644 > --- a/scripts/gdb/linux/constants.py.in > +++ b/scripts/gdb/linux/constants.py.in > @@ -12,8 +12,16 @@ > * > */ > > +#include > +#include > +#include > + > #include > +#include > #include > +#include > +#include > + > > /* We need to stringify expanded macros so that they can be parsed */ > > @@ -51,3 +59,29 @@ LX_VALUE(MNT_NOATIME) > LX_VALUE(MNT_NODIRATIME) > LX_VALUE(MNT_RELATIME) > > +/* asm/page.h */ > +LX_GDBPARSED(PAGE_SHIFT) > + > +/* asm/thread_info.h */ > +LX_GDBPARSED(THREAD_SIZE) > + > +/* linux/vmalloc.h */ > +LX_GDBPARSED(VMALLOC_TOTAL) > + > +/* linux/swap.h */ > +LX_GDBPARSED(MAX_SWAPFILES) > + > + > +/* Kernel Configs */ > +LX_CONFIG(CONFIG_HIGHMEM) > +LX_CONFIG(CONFIG_MEMORY_FAILURE) > +LX_CONFIG(CONFIG_TRANSPARENT_HUGEPAGE) > +LX_CONFIG(CONFIG_CMA) > +LX_CONFIG(CONFIG_MMU) > +LX_CONFIG(CONFIG_SWAP) > + > +#ifndef CONFIG_NR_QUICK > +#define CONFIG_NR_QUICK 0 > +#endif > +LX_VALUE(CONFIG_NR_QUICK) > +LX_CONFIG(CONFIG_QUICKLIST) > diff --git a/scripts/gdb/linux/proc.py b/scripts/gdb/linux/proc.py > index 115f20b07a54..e5a8dbe3aa3a 100644 > --- a/scripts/gdb/linux/proc.py > +++ b/scripts/gdb/linux/proc.py > @@ -195,3 +195,231 @@ values of that process namespace""" > info_opts(MNT_INFO, m_flags))) > > LxMounts() > + > + > +bdev_type = utils.CachedType("struct block_device") > +bdev_ptr_type = bdev_type.get_type().pointer() > + > + > +class LxMeminfo(gdb.Command): > + """ Identify the memory usage, statistics, and availability > + > +Equivalent to cat /proc/meminfo on a running target """ > + > + def __init__(self): > + super(LxMeminfo, self).__init__("lx-meminfo", gdb.COMMAND_DATA) > + > + def K(self, val): > + # Convert from PAGES to KB > + return int(val << (constants.LX_PAGE_SHIFT - 10)) > + > + def page_K(self, remote_value): > + # Obtain page value, and Convert from PAGES to KB > + val = int(gdb.parse_and_eval(remote_value)) > + return self.K(val) > + > + def gps(self, enum_zone_stat_item): > + # Access the Global Page State structure > + # I would prefer to read this structure in one go and then index > + # from the enum. But we can't determine the enum values with out > + # a call to GDB anyway so we may as well take the easy route and > + # get the value. > + remote_value = "vm_stat[" + enum_zone_stat_item + "].counter" > + return int(gdb.parse_and_eval(remote_value)) > + > + def gps_K(self, enum_zone_stat_item): > + return self.K(self.gps(enum_zone_stat_item)) > + > + def nr_blockdev_pages(self): > + bdevs_head = gdb.parse_and_eval("all_bdevs") > + pages = 0 > + for bdev in lists.list_for_each_entry(bdevs_head, > + bdev_ptr_type, > + "bd_list"): > + try: > + pages += bdev['bd_inode']['i_mapping']['nrpages'] > + except: > + # Any memory read failures are simply not counted > + pass > + return pages > + > + def total_swapcache_pages(self): > + pages = 0 > + if not constants.LX_CONFIG_SWAP: > + return 0 > + > + for i in range(0, int(constants.LX_MAX_SWAPFILES)): > + swap_space = "swapper_spaces[" + str(i) + "].nrpages" > + pages += int(gdb.parse_and_eval(swap_space)) > + return pages > + > + def vm_commit_limit(self, totalram_pages): > + total_swap_pages = 0 > + overcommit = int(gdb.parse_and_eval("sysctl_overcommit_kbytes")) > + overcommit_ratio = int(gdb.parse_and_eval("sysctl_overcommit_ratio")) > + > + if constants.LX_CONFIG_SWAP: > + total_swap_pages = int(gdb.parse_and_eval("total_swap_pages")) > + > + hugetlb_total_pages = 0 # hugetlb_total_pages() > + > + if overcommit: > + allowed = overcommit >> (constants.LX_PAGE_SHIFT - 10) > + else: > + allowed = ((totalram_pages - hugetlb_total_pages * > + overcommit_ratio / 100)) > + > + allowed += total_swap_pages > + return allowed > + > + def quicklist_total_size(self): > + count = 0 > + quicklist = utils.gdb_eval_or_none("quicklist") > + if quicklist is None: > + return 0 > + > + for cpu in cpus.each_online_cpu(): > + ql = cpus.per_cpu(quicklist, cpu) > + for q in range(0, constants.LX_CONFIG_NR_QUICK): > + # for (q = ql; q < ql + CONFIG_NR_QUICK; q++) > + # count += q->nr_pages > + count += ql[q]['nr_pages'] > + > + return count > + > + # Main lx-meminfo command execution > + # See fs/proc/meminfo.c:meminfo_proc_show() > + def invoke(self, arg, from_tty): > + totalram = int(gdb.parse_and_eval("totalram_pages")) > + freeram = self.gps("NR_FREE_PAGES") > + reclaimable = self.gps("NR_SLAB_RECLAIMABLE") > + unreclaimable = self.gps("NR_SLAB_UNRECLAIMABLE") > + slab = reclaimable + unreclaimable > + # for_each_zone(zone) > + # wmark_low += zone->watermark[WMARK_LOW]; > + wmark_low = 0 # Zone parsing is unimplemented > + > + available = freeram - wmark_low > + available += reclaimable - min(reclaimable / 2, wmark_low) > + > + bufferram = self.nr_blockdev_pages() > + swapcached = self.total_swapcache_pages() > + > + file_pages = self.gps("NR_FILE_PAGES") > + cached = file_pages - swapcached - bufferram > + > + # LRU Pages > + active_pages_anon = self.gps("NR_ACTIVE_ANON") > + inactive_pages_anon = self.gps("NR_INACTIVE_ANON") > + active_pages_file = self.gps("NR_ACTIVE_FILE") > + inactive_pages_file = self.gps("NR_INACTIVE_FILE") > + unevictable_pages = self.gps("NR_UNEVICTABLE") > + active_pages = active_pages_anon + active_pages_file > + inactive_pages = inactive_pages_anon + inactive_pages_file > + > + kernelstack = int(self.gps("NR_KERNEL_STACK") * > + constants.LX_THREAD_SIZE / 1024) > + > + commitlimit = int(self.vm_commit_limit(totalram)) > + committed_as = int(gdb.parse_and_eval("vm_committed_as.count")) > + > + vmalloc_total = int(constants.LX_VMALLOC_TOTAL >> 10) > + > + gdb.write( > + "MemTotal: {:8d} kB\n".format(self.K(totalram)) + > + "MemFree: {:8d} kB\n".format(self.K(freeram)) + > + "MemAvailable: {:8d} kB\n".format(self.K(available)) + > + "Buffers: {:8d} kB\n".format(self.K(bufferram)) + > + "Cached: {:8d} kB\n".format(self.K(cached)) + > + "SwapCached: {:8d} kB\n".format(self.K(swapcached)) + > + "Active: {:8d} kB\n".format(self.K(active_pages)) + > + "Inactive: {:8d} kB\n".format(self.K(inactive_pages)) + > + "Active(anon): {:8d} kB\n".format(self.K(active_pages_anon)) + > + "Inactive(anon): {:8d} kB\n".format(self.K(inactive_pages_anon)) + > + "Active(file): {:8d} kB\n".format(self.K(active_pages_file)) + > + "Inactive(file): {:8d} kB\n".format(self.K(inactive_pages_file)) + > + "Unevictable: {:8d} kB\n".format(self.K(unevictable_pages)) + > + "Mlocked: {:8d} kB\n".format(self.gps_K("NR_MLOCK")) > + ) > + > + if constants.LX_CONFIG_HIGHMEM: > + totalhigh = int(gdb.parse_and_eval("totalhigh_pages")) > + freehigh = int(gdb.parse_and_eval("nr_free_highpages()")) > + lowtotal = totalram - totalhigh > + lowfree = freeram - freehigh > + gdb.write( > + "HighTotal: {:8d} kB\n".format(self.K(totalhigh)) + > + "HighFree: {:8d} kB\n".format(self.K(freehigh)) + > + "LowTotal: {:8d} kB\n".format(self.K(lowtotal)) + > + "LowFree: {:8d} kB\n".format(self.K(lowfree)) > + ) > + > + if not constants.LX_CONFIG_MMU: > + mmap_pg_alloc = gdb.parse_and_eval("mmap_pages_allocated.counter") > + gdb.write( > + "MmapCopy: {:8d} kB\n".format(self.K(mmap_pg_alloc)) > + ) > + > + gdb.write( > + "SwapTotal: {:8d} kB\n".format(self.K(0)) + > + "SwapFree: {:8d} kB\n".format(self.K(0)) + > + "Dirty: {:8d} kB\n".format(self.gps_K("NR_FILE_DIRTY")) + > + "Writeback: {:8d} kB\n".format(self.gps_K("NR_WRITEBACK")) + > + "AnonPages: {:8d} kB\n".format(self.gps_K("NR_ANON_PAGES")) + > + "Mapped: {:8d} kB\n".format(self.gps_K("NR_FILE_MAPPED")) + > + "Shmem: {:8d} kB\n".format(self.gps_K("NR_SHMEM")) + > + "Slab: {:8d} kB\n".format(self.K(slab)) + > + "SReclaimable: {:8d} kB\n".format(self.K(reclaimable)) + > + "SUnreclaim: {:8d} kB\n".format(self.K(unreclaimable)) + > + "KernelStack: {:8d} kB\n".format(kernelstack) + > + "PageTables: {:8d} kB\n".format(self.gps_K("NR_PAGETABLE")) > + ) > + > + if constants.LX_CONFIG_QUICKLIST: > + quicklist = self.quicklist_total_size() > + gdb.write( > + "Quicklists: {:8d} kB\n".format(self.K(quicklist)) scripts/gdb/linux/proc.py:381:16: E121 continuation line under-indented for hanging indent Please make sure to run pep8 on the series before posting. Jan -- Siemens AG, Corporate Technology, CT RDA ITP SES-DE Corporate Competence Center Embedded Linux